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WR250R WR250X FMF PowerCore 4<br>Performance Package

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Home > Dual Sport > Yamaha WR250X/R Parts > FMF PowerCore 4 Hex Performance Package

We've combined several of the most popular FMF products for the WR250R and WR250X into a handy package deal. The PowerCore4 Hex Slip-On muffler, combined with a PowerBomb or MegaBomb header, provides a direct bolt-on exhaust system, and the optional EFI (electronic fuel injection) Controller is a plug-n-play device that will help take advantage of your new performance exhaust system.

Sound: The PowerCore 4 Hex Muffler included with this package is slightly louder than FMF's Q4 muffler. If you want an exhaust system that is a bit quieter, the FMF Q4 Performance Package is definitely the way to go.

Fitment: 2008-2019 Yamaha WR250R / WR250X


One (1) WR250R WR250X FMF PowerCore 4 Hex Slip-On Muffler:
  • Constructed from aircraft grade aluminum and high strength stainless steel
  • Removable USFS spark arrestor included
  • Pounds lighter than stock
  • Louder than the FMF Q4 System, but optional 96dB quiet insert available from direct from FMF
  • Part #044436

    Your choice of One (1) WR250R WR250X FMF PowerBomb or MegaBomb Header:
  • Stainless Steel Construction
  • Ideal for use with FMF PowerCore Muffler
  • PowerBomb available with optional stainless steel FMF Heat Shield
  • PowerBomb header makes better LOW to MID-RANGE power
  • MegaBomb header makes power across the entire powerband (LOW, MID, and TOP-END power)
  • PowerBomb: Part #044269
  • PowerBomb w/Stainless Steel Heat Shield: Part #044269 & #040231
  • MegaBomb: Part #044356

    ** OPTIONAL: EFI Controller (adds $225 to package price):
    An EFI (Electronic Fuel Injection) Controller, like the one from EJK ( or FMF Racing, is HIGHLY recommended any time you install an aftermarket exhaust and/or air filter on your fuel injected bike, otherwise you will see little to no performance gains, and the bike may even run poorly.
  • Pre-programmed specifically for the Yamaha WR250R/X with Stage 1 mods
  • Simple install. Plugs into existing wiring using the stock connectors
  • Unlike most other fuel-injection programmers, this one is load-sensitive
  • Additional tuning can be done and no laptop or software is required
  • Your choice of EJK brand or FMF brand (they both work identically)

    ** OPTIONAL: EXUP Servo Emulator (adds $55 to package price):
  • When you remove the OEM Yamaha WR250R/X exhaust, you will also be removing the EXUP cables and motor that are attached to the exhaust. This is a simple task, and involves un-plugging the EXUP Servo motor. 12oClockLabs offers an EXUP Servo Emulator which plugs right in so you're bikes computer won't realize you've removed anything. This optional part is highly recommended anytime you remove the OEM exhaust. Choose the option below if you want us to include it as part of the package.

    ** OPTIONAL: AIS Block Off Kit (adds $20 to package price):
  • When installing an aftermarket exhaust on your WR250R/X, the AIS (Air Induction System) is no longer serving any purpose and will cause backfiring/popping on deceleration. Once you remove the AIS from the bike, this kit can be used to block off the port/hose on the bike.

    Video Reviews:

    In Stock - Usually leaves our warehouse same business day

    NOTE: This item cannot be shipped to California.

    NOTE: To see configured price for the package, choose options below and click "ADD TO CART"...

    WR250R WR250X FMF PowerCore 4 Performance Package
    FMF-PWRCR-PKG-1Retail Price: $559.99Our Price: $459.95
    Muffler/Mid Pipe: 
    EFI Controller: 
    EXUP Servo Emulator: 
    AIS Block Off Kit: 

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