SKU: 33634833243

2018+ X3 172 HP STAGE 1 LOCK & LOAD KIT by Aftermarket Assassins

Sale price$369.00 Regular price$410.00
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Description

2018+ X3 172 HP STAGE 1 LOCK & LOAD KIT by Aftermarket AssassinsFree Shipping with in the Lower 48 States Kit fits 2018+ 172hp Base X3's or 2017 X3's with the 2018+ style fuel pump Lock & Load! This Stage 1 kit provide a big increase in horsepower and torque simplified into an easy package. Tuning and clutching on the X3 go together like high powered rifles and tannerite. Together they pack a huge punch for the ultimate power gains to the wheels. The tuning allows for great power depending on the level tune,

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  • Kit fits 2018+ 172hp Base X3's or 2017 X3's with the 2018+ style fuel pump
  • Lock & Load!  This Stage 1 kit provide a big increase in horsepower and torque simplified into an easy package.  Tuning and clutching on the X3 go together like high powered rifles and tannerite.  Together they pack a huge punch for the ultimate power gains to the wheels.   The tuning allows for great power depending on the level tune, supporting mods & fuel you want to run.  Tuning also allows for better power at higher RPM where the factory ECU calibration falls off. The clutching allows for RPM to ramp up faster, and to reach those higher RPM's where best power to the wheels is made in the real world.
  • If you have a stock X3 (performance parts wise) this kit is best combined with the level 2 tune.  If you have an exhaust or exhaust/intake you can start to venture deeper into other tunes.  Read more on this below in our tune specific descriptions.
  • ***These tunes are all for the 2018+ X3 with the factory fuel pump, or the 2017 X3 with the 2018 fuel pump***
  • Gains shown and listed are for 2018+ base power(139rwhp).  2017 base power was 126rwhp.
  • The Maverick X3 172 HP base is a great machine with good power from the factory, but whey stop there?  This 3 cylinder turbocharged motor has so much more potential!  After many hours testing on the dyno, and even more testing in the real world, we have what we believe to be the best tunes on the market for the 2018+ X3, or 2017 models with the upgraded fuel pump.  We modify many parameters and spent a TON of time fixing a few issues we saw from the factory when cranking up the boost.  
  • Not just dyno tested! We are avid riders and like the factory, a ton of the testing is done in the field to make sure you are getting 110%.  With data logging capabilities you can't get any better testing than real world.  Often times we can make significant changes to further increase power, drivability, and feel of the machine that can never be done on the dyno. We tune to max power for the fuel & supporting mods.  You won't find more power no matter what others claim.  We also have a longer history than nearly all competitors of tuning CVT transmission vehicles with turbochargers.
  • Throttle by wire limitations disabled giving wicked throttle response and power delivery (for sport mode)
  • Torque calculations set correctly to ensure the most performance at all times
  • Fuel tables modified to gain low end punch and safe yet powerful air/fuel ratios
  • Get rid of the lean punch!  The factory runs these things stupid lean when getting on boost and we fix that.
  • Boost tables properly modified for the fuel & modifications along with lightning quick turbo spool
  • Timing tables modified for best power per tune
  • Safety parameters to protect your motor and turbocharger are still in place
  • Speed limiters removed or raised depending on gear
  • 2 foot limiters removed & Start in any gear
  • Rev limit raised from 8300 to a safe 9000 RPM
  • Powervision flash tuner reprograms your ECU in roughly 8-10 minutes & easily installs by plugging into your diagnostic port
  • Easily return back to stock, switch tunes, or upgrade tunes at any time
  • A great gauge (see live boost and more) and data logging device
  • Our level 1 tune is designed for a completely stock 2018 X3 on 91 octane or better.  This tune runs an average of 16-16.5 PSI of boost and is a very safe tune to run on even 91 oxy/ethanol fuel.  Gains are right around 13-15hp to the wheels.  We found many competitors only offer a max pump gas tune and that simply does not work as well without having a good 91 non ethanol or 93 octane fuel.  If you run into this, your safety circuits will pull timing based on DET and can even go into a partial limp mode dropping you down to below stock boost levels. This is a great tune to have loaded on the tuner for such event that you get bad fuel.. it still rips, but won't push things as much. This tune absolutely tears on 16psi, and just keeps pulling all day long.  It works well with a 100% factory machine or with a  slip-on exhaust, cat delete, full exhaust, and/or an intake kit.  The stock waste gate spring pressure of 7-8psi is good for 2018+ Models. 2017 models with 18 fuel pumps should adjust 2-3 turns.
  •  Our level 2 tune is again designed for 91-93 octane and is a max tune on the stock exhaust. This tune is absolutely nuts for being able to run on a bone stock X3..  Boost comes on hard and keeps pulling like an animal.  Peak boost is around 17-18psi, and settles down to roughly 16-17psi.  We spent a huge amount of time tuning and reviewing logs on pump gas to squeeze everything possible on 91 pump gas, and this is it. You simply can't find a more powerful tune on a stock X3 172 base. This tune will work even better with an exhaust like our 3" full system. An intake kit like ours is HIGHLY recommended.  Clutching is not needed but also recommended.  The stock waste gate spring pressure of 7-8psi is good for 2018+ Models. 2017 models with 18 fuel pumps should adjust 2-3 turns.
  •  Our level 3 tune puts the hammer down on 91-93 octane.  Like our level 2, this tune simply rips on pump gas but requires a full exhaust like our 3" system to run 91 octane as well as a high flow intake.  If you run 93 octane (or boost your 91 to 93) you can run this tune on the factory exhaust(however you'll leave some power on the table). It will peak around 18-19psi and sustain around 17-17.5psi.... half a pound of boost higher than level 2.  This is a big 23-25hp gain over factory. This tune requires a high flow intake kit like ours. Clutching is recommended. We recommend shortening your waste gate rode by 1 turn with this tune. 2017 models with 18 fuel pumps should adjust 2-3 turns.
  • Level 4 adds a bit of race fuel to the mix!   This tune is designed for 98-100 octane (will run on UTV 96) and was developed using one can of VP Octanium Unleaded to a tank of fuel.  Mixing other race fuel with the tune to get 100 octane output would work great, just keep in mind leaded fuels can take out o2 sensors when running leaded fuel consistently.    This tune runs around 18-18.5psi and produce 175rwhp and is extremely fast. 2018 models adjust your waste gate 2 turns shorter. 2017 models with 18 fuel pumps should adjust 4-5 turns.  Crack pressure should be 9psi.  Intake and exhaust are required for this tune, clutching is recommended.
  •  Level 4AV is the same as the level 4 tune but designed to run 100 LL AV gas found at your local airport.  This fuel has a different specific gravity with the oxygenation and other characteristics.  Running a tune not meant for this fuel can make it act lean and therefor you will not get the full power and potential from the fuel.  This tune modifies fuel tables to be able to run 100 LL AV gas and reap all the benefits.  
  • Level 5 Kill mode is here!  This tune is developed for 110 Leaded, or MS109 fuel (or better).  This tune is an absolute riot and will leave others in the dust.  We throw down a huge 185-190rwhp with this tune at 19-20psi of boost, with a wicked timing curve for the big octane fuel.  This one will throw you back in the seat as soon as you get on the throttle, and keep pulling for days!  Hands down, this is the highest horsepower tune possible on the factory turbo/waste gate & factory injectors.  This tune requires an exhaust system, high flow intake, and clutching. 2018 models adjust your waste gate 5 turns shorter. 2017 models with 18 fuel pumps should adjust 7-8 turns.  Crack pressure should be 10-12psi.
  • Level 6 Kill mode squared is running on corn!  This E85 tune packs as much if not more punch than the level 5 tune but must be used with our big injectors.  This tune is an absolute riot and will leave others in the dust.  We throw down a huge 185-190 RWHP with this tune at 19-20 PSI of boost, with a wicked timing curve for the cool burning E85.  This one will throw you back in the seat as soon as you get on the throttle, and keep pulling for days!  Hands down, this is the highest horsepower tune possible on the factory turbo/waste gate.  This tune requires an exhaust system, high flow intake, clutching & the wastegate turned in (shorter) so only 7-8 turns with a crack pressure of 10-12 PSI.  
  •  How to:  Waste Gate Adjustment 
  • All our gas tunes are available on our large injectors, so there is no need to switch.  The only reason to go big injector is if you plan on running E85.  If you don't plan on running E85, just stick with the factory injectors.
  • Max boost levels are listed as reference only. Altitude, temperature, charge temps, intercooler temps and many other conditions play into a factor of final boost output. AA tunes do a better job of making sure you reach these levels as the factory tunes are overly safe.
  • PV3 quick install video & setup to make sure you are running correctly:  PV3 Can Am Video
  • S2 kits include our AA Recoil magnetic adjustable clutch weights, our primary spring & setup guideline.  
  • Our setup guideline will let you know how to set your weights for stock horsepower to 200rwhp, 28" - 32" tires, 28-32" paddle tires, different altitudes & more.
  • Fully adjustable magnetic weights are easy to use, and with our special tool are also easy to adjust
  • Adjustable from 50 to 64 grams.  Weights have more tip weight and act heavier.  This means they also accelerate and up shift much harder.
  • Cooler running belt temps from a more efficient power transfer which results in longer belt and clutch life.  With this kit and our Stryker belts (gboost belt) we have ran thousands of hard miles in the dunes & trails at higher horsepower with ZERO belt failures.  
  • Close to stock engagement which is very smooth (Higher engagement springs available if needed)
  • Select your exact year/model which lets us know what weights to send you as the clutch casting is different between some years and models.  2017 X3's and 2018 120HP Base X3's (Kit 108-1008-A) use the same casting, while 2018+ 172HP Base X3's along with 2019+ 120HP (Kit 108-1008-B) use the new style clutch casting.  This is a very minor change, but our weights needed slight modification to work.  If you upgraded your older style casting to a new one, please let us know in the order notes.
  • Our Recoil clutch weights are easily adjustable with simple magnets.  They have a custom AA profile, the BEST coating on the market(nitrocarburizing) which has increased wear resistance, improved fatigue strength, and added surface lubricity. These clutch weights also offer great performance, and the ability to tune for many different applications or modification in the future, without the need to buy extra parts.  The magnetic weights are the best option to properly place the mass where we need it on the weight for best performance for your application.
  • Our special clutch tool, clutch compression tool and clutch puller are needed to install this clutch kit.  Find these tools HERE
  • Target peak RPM for stock or any other tune with the rev limit set between 8300-8700 RPM is 7700-7900 RPM.  For AA tunes and other tunes with an 8800-9000 RPM rev limit, target should be 7900-8300.  Testing should be done on a somewhat level ground from a 10-20mph roll on to full WOT and RPM checked as passing by 55-60MPH.
  • See this VIDEO on how to install this clutch kit
  • If ordering internationally you will be invoiced separately for shipping
  • Get ready to hang on, your X3 is about to transform!

jds 1/25/23

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 33634833243

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4.1 ★★★★★
Based on 28 reviews
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D
Verified Purchase
Dave
Bozeman, US
★★★★★ 1
Review from an "actual" tall person who doesn't weigh 400 pounds.
Color: Black
I recommend this chair. Firstly, I looked at least dozens of chairs and nearly every review in trying to select a chair. I didn't want to spend $200. It's confusing because everyone's idea of perfect is of course subjective. One thing, What is tall? I'm 6'6" I think that's pretty tall. Others feel that 6'0" is tall. LOL In the listing, it shows this chair is good for a 6'5" person which I think is pretty accurate. I weigh about 210 pounds and the padding is just fine. One thing I would push manufacturers to do would be to give accurate measurements. Seat height low and high. Back support height. Head rest added to back height etc.! Maybe actual human measurements that the chair is geared toward. Nice to know that 400 lbs is cool but that doesn't tell me much. My primary goal was to find a chair I could sleep in because I recently had a back injury and sleeping on my bed, while fine, resulted in intense pain trying to get up in the morning. We'll see what happens but the headrest reaches my head which was goal one. The lumbar fits so I don't need to use cushions and pads etc. I found the upper position of the support to be right for me and it's super comfortable. Plus number two. The raised height of the chair fits my long legs (inseam 36") Plus three. I wanted adjustable arm rests but this one doesn't have that. No biggie, for me the height of the arm rests is pretty much just right. It might be a little high for some. The back leaning adjustment doesn't lock except for upright. Locking upright is good, and leaning back - for me - doesn't really need to lock. Being an actual tall person made me really skeptical. I'm relieved that I won't have to take it apart to return it. The assembly was straight forward and pretty easy though I'd suggest not really tightening the arms snugly before getting the back squared away - the alignment is easier if you do that. I got the chair for $109 with 21% off. It's slightly wobbly yet feels pretty well made. It rolls well enough. I'm quite satisfied with the purchase and I'll come back if there are updates. Edit one. I've had it a week now and found I couldn't sleep in it. I think it would be better if the back could recline separately from the seat. There might also be figuring out a way to support my legs due to the back and seat reclining together rather than separately. Two. I kind of wish more now that the arms were adjustable for height and tilt if that makes sense. I have a bar stool next to me on the right in front of my desk that is the right height to relax my right arm while reaching my mouse on the desk so that's my work around there. Three. The casters are kind of basic and don't roll as easily on the floor matt as my former second hand chair - they would probably be fine on a hard surface. I'll probably switch them out. Four: The lumbar support, while mostly in the right place is unpadded and creates kind of a hard spot there. I've re-introduced my lumbar support pillows for comfort there. All in all, I'm still happy with the $100 purchase. In my experience, being pretty tall always comes with compromise and these notes are not deal breakers for me. Yea, It can always be more perfect but unless you're in a showroom test driving and willing to spend $300? Right. UPDATE: I'm really not satisfied with this chair and in fact, I wish I hadn't bought it. Firstly, the pneumatic post that the chair part connects with is wobbly depending on which way it is facing according to which way the legs are aligned. It's like a poor fit and I'm pretty mechanically inclined. Second and also important. The lock to keep it upright and inclined only worked for a few weeks. For a while, you had to mess with it to engage the upright position. It no longer works. Worse than that, the lumbar support pad disconnected with the chair and is now floating and after only a month or so, the remaining supports for the Lumbar rest have dug into the fabric on the back of the chair creating holes in the back's fabric. I've tried but there is no way to reconnect that bit without removing the back's fabric as far as I can see. I'm taking this down to one star for sure. Poor design? Poor manufacturing? Yea. I wouldn't suggest this chair to anyone. If the company comes up with a solution, I'll continue my review. As for now. Not a recommendation. Update: Not impressed and kind of crappy. Mentioned is that the so called lumbar thingy disconnected and is unusable. I've got my own pad which seems to help. Also, it's wiggly where the chair connects to the base. Months later, I might toss it and go back to the chair I bought locally and second hand. Don't buy this chair!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 20, 2025
Q
Verified Purchase
QZ
Bozeman, US
★★★★★ 5
Great Instructions, Straightforward Assembly
Color: Black
I just received this chair today, so my product review is mostly on the packaging, instructions, and assembly. The product was well-packaged, and it was obvious when I unboxed it that a lot of care and thought went into packing it in the most efficient way that would also protect the parts. I was positively impressed with the packaging. I was also incredibly impressed with the instructions and assembly process. I am used to cheaper products where the parts only half fit or important components are missing, or where the instructions were confusing and unclear. This chair's instruction manual was very clear and concise. The diagrams were easy to understand and neat. The screws came labeled and separated and also included the scew types and sizes/lengths, which is handy in case you need to pick up extras at a store somewhere. But they also included one extra of each type of screw, washer, and cover, which I appreciated during assembly. (I didn't find myself worrying what would happen if I dropped a screw, which is something I would normally be distsracted by while working.) The only things I would take points off for were these: 1. The instructions said the chair came with gloves for assembly, but no gloves were included. That was fine with me, but why mention them if you won't include them? The instructions even later say not to use the chair if not all components were present...but all the important ones were, so I assembled it without gloves (as I probably would have done anyway, since it was for me and not another person). 2. It matters which side of the seat is the front, but the sticker was confusing. The instructions show a sticker placed on the side that is the front, and that is where my sticker was placed. However, the sticker says "FRONT" and has an arrow pointing somewhere. In the instructions this arrow pointed to the front. On my seat, however, the arrow pointed to the back. So am I supposed to believe the sticker placement (it was diagonal, so it looked haphazardly slapped on) or the arrow? On that particular step the piece you are screwing into the seat can fit both ways, but thankfully there is a later step where it becomes obvious which side is the front vs. the back. (The arm rests can only be attached to the back.) So I wish that had been clearer up front, but otherwise it was okay. Recommendations for assembly: - To attach the wheels, apply firm, direct, straight-down pressure. I tried screwing them on at first but you just push. Make sure they go in the whole way like the picture shows. - When they say to tighten the screws to only 60%, it's a helpful tip, because you can't fit the armrests on both the seat and chairback at the same time with the screws completely tightened. Just tighten them enough to fit the pieces on, then later you can tighten up the screws. So far I find the chair to be very comfortable and I'm exceedingly happy with it. The lumbar support seems like it could potentially be a little chafy or scratchy, but I'll give the chair a chance before deciding if it's problematic or not. Like I said, I only got the chair today, so I can't speak much to its long-term comfort, durability, or longevity. But I was so impressed with how easy and straightforward they made the assembly that I had to write a review to show my appreciation.
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Reviewed in the United States on May 9, 2026
A
Verified Purchase
Alicia Sherman
Chelsea, US
★★★★★ 3
It's okay
Color: Black
Appeared to be a super comfortable chair. Purchased for my mother to work from home and the material is apparently slightly itchy and the arm rest isn't quite comfortable. It was pretty simple to put together but it did take some time.
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Reviewed in the United States on June 11, 2026
C
Verified Purchase
Corbin
Battle Creek, US
★★★★★ 5
An Actual Nice Chair for a Decent Price. +2 for the Tool.
Color: Black Grey
Welp, My old chair finally broke, so It was time for a new one. I ended up coming across this chair here, and I couldn't really find anyone talking about it online. I decided to give it a shot since it was on a good sale for Christmas, going down to 99$. I'm going to be honest, I am pleasantly surprised. The cushioning for it is a little firm, but that is perfect for me. Its pretty average when it comes to office chairs, but having the added lower back support is a great touch. I have no complaints about it. The one thing that I am actually really happy about isn't on the chair. Don't get me wrong, over the week I have been using it, It has been nothing but great. That thing is the actual tool it came with. Its a basic Allen key, but the top of it is a molded handle instead of a "L" piece of metal. It made the already easy process of putting together this chair even better. Even after this chair has ran its course like all other chairs, I'm going to still use this tool. So yeah, I think 5 - stars pretty accurately describes how I feel about my chair.
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Reviewed in the United States on January 2, 2026
C
Verified Purchase
Christian Birkenberger
Natrona Heights, US
★★★★★ 5
Comfortable chair that works great for long hours
Color: Black
I’ve been using this office chair for a few days and it’s been very comfortable for working and longer desk sessions. The high back design and ergonomic support help maintain good posture, while the cushioning stays comfortable throughout the day. The chair feels sturdy and stable, and the 330 lb capacity gives it a solid, durable feel. It also rolls smoothly and quietly, which is nice when moving around the workspace without creating a lot of noise. Overall, it was easy to assemble, looks professional, and offers great value for the money.
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Reviewed in the United States on June 10, 2026

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