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Yoshimura RS-4 Stainless/Aluminum Full System
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Yoshimura RS-4 Stainless/Aluminum Full System

Our price: $493.99$607.99

MSRP: $675.00 - $725.95 - You save up to $181.01 (27% 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 Yoshimura RS-4 Stainless/Aluminum Full System is pentagonal shaped muffler that features a carbon fiber cone end cap, two staged stepped baffle and striking good looks. A tapered header pipe design is used for optimal flow and performance. The RS-4 muffler features a new front cap design that functions as a polyresonant chamber. This design makes for a quieter muffler with improved mid to top end power. Comes complete with an AMA-approved sound insert installed in the muffler.
  • Carbon Fiber cone end-cap
  • Light weight
  • Resonating chamber produces lower decibels
  • Improved mid-to-top-end power
  • An AMA-approved sound insert comes installed in the muffler

Yoshimura RS-4 Stainless/Aluminum Full System Reviews

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0 of 0 people found this review helpful.

Great soumd and power

Comments On May 02, 2014:This was one of the best exhausts i have ever baught. It holds up very good on the sand or in the mud and trails. I ride trails in norther mi and it has a great sound and proforms good.

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0 of 0 people found this review helpful.

Awesome Pipe!!!!

Comments On May 01, 2014:I just bought my bike and the pipe came with it, so I don't know what it's like without it. But I absolutely love it! I love the way it sounds and adds great power to the bike. Everyone I've shown the bike to say they love the pipe on it. Would recommend to anyone!

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0 of 0 people found this review helpful.


Comments On Apr 13, 2014:easy to install all around amazing pipe good quality and the extra power is always good also.

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1 of 1 people found this review helpful.

be like Bubba...

Comments On Apr 09, 2014:...except the crashes. I have ridden with the ti system as well, do not think that the more $ you spend, the more power you make. the stainless system does what its supposed to do and looks great too. this thing hold up to mx and tip overs. header doesn't get dinged up from rocks like a soft ti header. let the rich people buy the expensive stuff. for guys like me, stainless is the way to go. put the other $500 toward your suspension.

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1 of 1 people found this review helpful.

Great buy!

Comments On Dec 30, 2013:Bolton right on no problem, makes good noticeable power all across the curve and looks great!

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0 of 0 people found this review helpful.

worth it

Comments On Jul 27, 2013:This system made the bike sound good, added a little power. I would recommend a quite core insert if you ride places with decibel level restrictions.

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3 of 3 people found this review helpful.

awesome exhaust system, Great quality

Comments On Dec 10, 2012:Before I installed this exhaust my Yz450 the bike Felt like it lagged a little from the bottom all the way to the top, but especially on top. After I installed this system on my bike the power just seemed to pull forever, excellent torque. Mine even came with the spark arrestor which is removable with one bolt. The aesthetics of this exhaust are great for the price. Very durable system, I have been using this exhaust for about a year now and have not one complaint what so ever. I really believe Yoshimura didn't cut any corners when they designed this product. Also has a nice mean sound to it with out it being obnoxiously loud. Again great product definitely give it a try.

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0 of 1 people found this review helpful.

Yoshimura RS-4 Exhaust

Comments On Dec 02, 2012:The bike really does better with the exhaust and has a better sound than stock. Plus it looks better than stock pipe all around.. and a good price for the system.

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1 of 1 people found this review helpful.

Great exhaust

Comments On Nov 27, 2012:This exhaust really opened up my 250f. Its power is broad and smooth, definitely a noticeable difference over stock. I didnt even have to rejet the bike, I installed an adjustable fuel screw and the bike rips. It sounds great too, I prefer it over my friends FMF and DRD exhaust systems.

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1 of 1 people found this review helpful.

Adds Power with Only a Tiny Weight Gain

Comments On Jul 03, 2012:I put the full Rs-4 Stainless sytem on my 2011 KTM 350sxf and it added alot of power, maybe a bit too much power for me. It also changed the handling a little bit, making it a tiny bit more top-heavy. It also took away a little bit of the engine breaking and made the bike run lean. When I realized this I took it off and weighed it, thinking it was heavier than the stock system. It turned out the stock system weighed 7.4 pounds and this system weighed 7.6 pounds so it was only 3.2 ounces heavier than the stock system.
You can beat the $480 price on RM especially since the spark arrested muffler is already $350.

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