MACE PERFORMANCE 6.35MM PLENUM SPACER TO SUIT FPV FORCE 8 BF BOSS 290 5.4L V8
SKU: 53648787359

MACE PERFORMANCE 6.35MM PLENUM SPACER TO SUIT FPV FORCE 8 BF BOSS 290 5.4L V8

Sale price$82.80 Regular price$92.00
Save 10%

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 9 - Jul 14

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

MACE PERFORMANCE 6.35MM PLENUM SPACER TO SUIT FPV FORCE 8 BF BOSS 290 5.4L V8Exclusive to Mace Engineering is our design registered plenum spacer to suit FPV Boss 290 and 315 V8 engines. What is a plenum spacer and what does it do? A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air

Exclusive to Mace Engineering is our design-registered plenum spacer to suit FPV Boss 290 and 315 V8 engines.

What is a plenum spacer and what does it do?

A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air momentum, resulting in better air distribution and power. The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also help prevent any costly rebuilds through dangerous lean outs that occur with standard manifolds in high horsepower/boost applications (due to poor air distribution).

In addition to improving air distribution between cylinders, the increase in plenum volume also has a positive effect on bottom end torque.

The fact these spacers are manufactured from the same thermal resistant composite material as our manifold insulators means further horsepower gains are possible due to the reduction in heat soak.

Key benefits:

  • Design registered.
  • Reduces charge air temperature resulting in better power consistency and detonation prevention.
  • Power increase with no undesirable side effects.
  • Improved air distribution between each cylinder.
  • Improved fuel economy.
  • Easy to install.
  • Can be used as a replacement gasket.
  • Reusable.
  • Proven gains at an affordable price.

Contents:

  • 01 XPlenum spacer
  • 01 X Silicone gasket maker
  • 04 X Spacer bush

Vehicle Fitment Guide

Note: Installation is very straight forward, requiring only the removal of your plenum cover to install the plenum spacer.

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: 53648787359

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.6 ★★★★★
Based on 1333 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
N
Verified Purchase
Nelson G.
New York, US
★★★★★ 5
Great item
Well constructed. Great quality. Fit perfectly in 2023 honda pilot. Nice value.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 17, 2026
V
Verified Purchase
Vercingeterix
Los Angeles, US
★★★★★ 5
It fits, just install it exactly like the original filter.
This fits just fine. Please pay attention to install it exactly like the OEM filter is installed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 23, 2026
M
Verified Purchase
Mark Twaing
West Palm Beach, US
★★★★★ 5
If you keep your vehicles a few years this will save money
I have been using K&N for 50 years very good quality over OEM filters and it gives your engine better breathing. Saves money over the long run.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 18, 2026
D
Verified Purchase
Dennis
Whiting, US
★★★★★ 5
Can’t go wrong with KN
Been using for years in all my vehicles. One time pricey but then years of trouble free performance enhancing filtration for your engine. Five minutes to install on 24’ Honda Pilot.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
C
Verified Purchase
Chuck Johnson
New York, US
★★★★★ 5
Good value
It’s a K&N quality filter, enough said
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026

recommand products