FMF PowerCore 4 Hex Full Exhaust System with MegaBomb Header & Side Panel

Item Number: 357421


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Product Description

FMF Racing

FMF PowerCore 4 Hex Full Exhaust System with MegaBomb Header & Side Panel

FMF designed the PowerCore 4 HEX with an eye towards top-of-the-line to deliver race-inspired performance at an economical price. The end result is a quality exhaust with improved torque, increased horsepower and rugged durability throughout the entire RPM range.

Each exhaust comes with FMF's proprietary MegaBomb header. The science behind the MegaBomb header actually reduces noise levels by as much as 1.5 dB when compared to conventionally-shaped headers to keep race and track officials happy. In addition, the headers are designed to produce more low end to mid range gains as well as broadening out the mid to top end power gains when compared to the stock exhaust layout.

  • Overall increase in power and torque
  • Muffler comes with a left side UFO side panel to trim off the fat when going from the OEM dual-muffler configuration to FMF's single muffler set up
  • MegaBomb header for the ultimate in power output
  • Durable stainless steel headers, mid-pipe, and aluminum muffler sleeve construction
  • Space age internal packing material for maximum longevity
  • Internal shape of core uses FMF's well-known Hi-Flo technology
  • Enhanced sonic evacuation provides for higher flow and increased power
  • Includes removable USFS-approved spark arrestor
  • FMF quiet insert available (sold separately)
  • Made in the USA

Spec Details
Color Clear
Configuration Single
Country Of Origin USA
Finish Anodized
Header MegaBomb
Header Construction Stainless Steel
Muffler End Cap Stainless Steel
Muffler Sleeve Aluminum
USFS Spark Arrestor Yes

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping. Don't waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.


  • CRF450R 2017-2018
  • CRF450RX 2017-2018

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