WR250R WR250X FMF PowerCore 4 Performance Package
WR250R WR250X FMF PowerCore 4 Performance Package
(some optional parts shown in photos)

We no longer carry this product, but you can order it and other exhaust systems from one of our trusted partners/affiliates. If you make a purchase from them, we do receive a small portion of the sale, at no extra cost to you.

  • WR250R FMF PowerCore4 Slip-On Muffler at Revzilla

  • WR250R FMF PowerBomb Header at Revzilla

  • WR250R FMF MegaBomb Header at Revzilla

  • WR250R Yoshimura RS-4 Slip-On Muffler at Revzilla

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

    This FMF Q4 Performance Package allows you to choose your own performance exhaust components based on your needs. The package is based around the FMF PowerCore4 Hex Slip-On muffler. You can either use your stock header pipe with the PC4 muffler, or optionally add to the package one of FMF's header pipes... either the PowerBomb or MegaBomb. Additional options for the package include an EFI (electronic fuel injection) Controller, which is a plug-n-play device that will help take advantage of your new performance exhaust system. Finally you can also choose to add an EXUP Emulator and AIS removal kit to the package (details below).

    Header Recommendations: Due to customer requests, we have changed our FMF packages to no longer require that you purchase an FMF header pipe, and instead you can use your stock header pipe with the FMF muffler. That being said, we do however still recommend the FMF header over the bikes stock header.... it is slightly larger in size, and does feature FMF's PowerBulge technology... plus, it just looks much much cooler. We've been running FMF MegaBomb headers on our bikes, and that is our header pipe of choice. It is also the most popular header we sell for these bikes.

    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: 2008-2020 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
  • Includes mid pipe insert if you want to use with the smaller stock header pipe
  • Louder than the FMF Q4 System, but optional 96dB quiet insert available from direct from FMF
  • Part #044436


    ** OPTIONAL: Use stock header pipe, or add an FMF PowerBomb or MegaBomb Header (adds to package price):
  • 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 to package price):
    An EFI (Electronic Fuel Injection) Controller 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. At this time, we offer three different EFI options, the EJK EFI Controller, or the Dynojet PowerCommander V. Details below. Each are simple to install and plug into existing wiring using stock connectors.
  • EJK EFI Controller - Part #9310207 (click for more info)
  • JD Jetting EFI Controller - Part #JDYX04 (click for more info)
  • Dynojet PowerCommander V - Part #22-016 (click for more info)

    ** OPTIONAL: EXUP Servo Emulator (adds 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 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:

    WR250R WR250X FMF PowerCore 4 Performance Package
    Muffler/Mid Pipe: 
    EFI Controller: 
    EXUP Servo Emulator: 
    AIS Block Off Kit: 

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