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

Our price: $327.99$382.99

MSRP: $415.00 - $425.00 - You save up to $87.01 (21% off)

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  • "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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    The new Yoshimura RS-4 motorcycle exhaust was developed using experience gained during R&D for Race Team exhausts, and it works brilliantly. The MX exhaust offers great horsepower gains, weight savings, and or course that great Yoshimura look.
  • RS-4 Pentagonal shaped muffler that features a carbon end cap, two staged stepped baffle, and striking good looks.
  • The muffler features a new front cap design that functions as a polyresonant chamber. The design makes for a quieter muffler with improved mid and top end power.
  • Silencer comes with a 94db sound insert.

Yoshimura RS-4 Stainless/Aluminum Slip-On Reviews

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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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1 of 1 people found this review helpful.

Great Product

Comments On Nov 14, 2012:I really like this pipe. It is quiet and is very nice quality.

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2 of 2 people found this review helpful.

What was expected!!!!

Comments On Sep 28, 2012:If you are looking more power with minimum spending and doing internal work, this is for you. Put this on my 2012 crf450r. Slip-on gives an immediate increase in power. No need to remap, works out of the box. Couple this with a Power-Flow filter from Twin Air and hold on. Increases pull into mid/upper 9,000 rpm range. When the new power wears off, a re-map and pulling the spark-arrestor will do the trick. Now need to stock up on some fresh tires to put the SCARY back in it.

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