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Yoshimura RS-4 Stainless/Aluminum Slip-On
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    Yoshimura RS-4 Stainless/Aluminum Slip-On

    Fits: 2013 KTM 450 XC-F
    Part# 1285370007

    Our price: $382.99

    MSRP: $425.00 - You save $42.01 (10% off)

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    5+ In-Stock

    • "Customer service is priority #1 at Rocky Mountain ATV/MC. We value our customers and strive to be the best shopping experience- when you buy from us, you are buying lifetime service."

      -Dan Thomas, CEO and Founder

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      Yosh’s RS-4 Slip-on is a staple in their race-tested lineup that maximizes weight savings and power to give you the ride of your life. The RS-4 is set apart by its pentagonal muffler shape that is done specifically to maximize internal volume without making the entire slip-on unwieldy in size. The front cap of the RS-4 is a newly designed polyresonant chamber that works along with the stepped, two-stage core baffle to lower sound and bump up power output in the mid to top end of your power band. Yoshimura has designed the RS-4 for good looks too with the stainless steel and aluminum giving the slip-on a clean look and the carbon end cap bringing the attitude. It’s more than skin deep though as the RS-4 is built to last seasons of hard riding. It connects to the header pipe using a robust clamp, not just gasket maker, and secures to the bike using a mounting tab that is welded to the muffler instead of riveted for long lasting durability.

      With a twist of your wrist you can find out how much of a difference the Yoshimura RS-4 will make to your bike ’s performance. Get some new gloves, because you’ll need to hold on tight.

    • Includes 94dB sound insert
    • Polyresonant chamber in front cap
    • Clamps to head pipe
    • Welded mounting bracket
    • Increases mid and high range performance
    • Increased packing volume with pentagonal shape
    • Stepped, two-stage baffle
    • NOTE: Depending on application, Yoshimura may recommend rejetting/remapping

    Yoshimura RS-4 Stainless/Aluminum Slip-On Reviews

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    0 of 0 people found this review helpful.

    spark arrestor

    Comments On Sep 23, 2015:really good pipe, good sound,good fit, looks great. no sparkarestor

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    0 of 0 people found this review helpful.


    Comments On Mar 17, 2015:everything fit perfect but did not come with a rubber spacer so had to buy my own to make it bolt on to my bike but other then that perfect.

    Additional Comments On Mar 17, 2015:was very easy to install and very simple.

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    0 of 0 people found this review helpful.

    As expected

    Comments On Dec 31, 2014:No noticeable power increase but it sounds really good.

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    1 of 1 people found this review helpful.

    No spark arrestor!

    Comments On May 11, 2014:Read a lot of reviews before I purchased and most people said that it had a spark arrestor. Mine did not come with one. Was disappointed about that. Power comes on harder on the top end and sounds great!

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    0 of 0 people found this review helpful.

    Rs-4 Yoshimura

    Comments On May 02, 2014:Great silencer sounds greats, has took a lot of abuse and held up great. I personally could not tell no difference as far as power gains but may have helped a little.

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    1 of 1 people found this review helpful.

    Looks great and sounds even better!!!

    Comments On Apr 07, 2014:This pipe is amazing for lack of a better word and RM has the best price period. This pipe looks great, sounds great, and even performs great. The finish is absolutely beautiful and the carbon fiber adds a nice touch. The 2009 crf450r suffers from lack of top end and this pipe definitely helps. I'll dare say its the best mod for the money on this bike!

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    1 of 2 people found this review helpful.

    Instant power!

    Comments On Dec 30, 2013:Loved this exhaust! Gave that yoshimura sound and the power was very nice!

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    1 of 1 people found this review helpful.


    Comments On Apr 11, 2013:noticeable power increase throughout the Power Range. looks and sounds killer as well. Fits nice and snug, Quick Install.

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    1 of 1 people found this review helpful.

    Looks awesome

    Comments On Mar 30, 2013:Great looks sounds good without being too loud and also has a spark arrestor.

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    1 of 1 people found this review helpful.

    Slip on muffler

    Comments On Nov 23, 2012:Ran it with the spark arrestor removed and the bike ran fine, very noticble power increase down low. I went ahead and got my ecu re mapped and even better

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