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Yamaha WR250X/R Parts > Yoshimura RS-4 Slip-On Muffler Package
Everything you need to unleash the full potential of your Yamaha WR250R or WR250X! Our Yoshimura RS-4 Performance Slip-On Muffler Package starts out with Yoshimura's RS-4 Slip-On Muffler, featuring a turn-out end-cap, mid-pipe, and low-volume insert. This system re-uses your stock header pipe which connects to the Yoshi mid pipe. You can optionally add an EFI (electronic fuel injection) Controller, which is a plug-n-play device that will help take advantage of your new performance exhaust system and also make your bike run properly. Finally you can also choose to add an EXUP Emulator and AIS removal kit to the package (details below).
The Yoshimura RS-4 Muffler is a unique design with predicated power and a quiet earthy exhaust note that speaks volumes for performance. This RS-4 features all the benefits of Yoshi's original RS-4 muffler, but with a unique turned-out end-cap, designed to direct exhaust heat and gases away from the bike's components. To top-it-off, they embossed the Yoshimura "347" logo in the carbon for a clean look. A heat-shield was also added to the poly-resonant chamber to keep rider and passenger legs from exhaust heat. With all its benefits in mind, the RS-4 was an obvious choice for the WR250R/X.
Fitment: 2008+ Yamaha WR250R / WR250X
PACKAGE INCLUDES THE FOLLOWING...
Yoshimura RS-4 Muffler with turned-out Carbon Fiber end cap
Yoshimura Stainless Steel Mid-Pipe
Yoshimura RS-4 Pre-installed spark arrestor insert
Muffler Heat Shield
All installation hardware
Yoshimura Part #133002D520
** 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 ** 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)
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 muffler, 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.
** In Stock - Usually leaves our warehouse in 1-2 business days
NOTE: We cannot ship this product to California, Alaska, Hawaii or Canada. If you are from any of these locations and order one, it will have to be removed from the order.
NOTE: To see configured price for the package, choose options below and click "ADD TO CART"...
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