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Yoshimura RS-4 Full System Exhaust

Retail: $594.99 - $799.99
$539.99 - $719.99
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Product Description

The RS-4 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 the 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 Yoshimura's "347" logo in the carbon for a clean look. With all its benefits in mind, the RS-4 was an obvious choice for the WR450F.

  • Aluminum pentagonal shaped muffler sleeve and aluminum mount bracket.
  • Features a polyresonant duplex chamber, a two-staged stepped baffle, and an innovative carbon cone end cap.
  • Durable high-grade stainless steel tapered header and mid-pipe.
  • Considerable weight reduction.
  • Carbon fiber end cap comes with a U.S.F.S.-approved Spark Arrested insert installed in the muffler.
  • Step-by-step directions and all necessary hardware included for an easy installation.

Note: For closed course competition use only. Not intended for street use.

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1-4 of 4
Verified Purchaser
Location: menifee,ca
Good buy

fit great on my 2012 crf 250 sounds great Bike revs faster the head pipe is the same as stock with out the heat shield so save some money and get the slip on system

Top 1000 Contributor
Location: Cimarron,KS
Sick as heck!!!!!!

this full exhaust system is da stuff!!! quick & easy to put on! sounds very nice! and omgosh power everywhere now! comin out of a turn and pinn the throttle your front tire will be lifting up!!! GREAT PIPE!!

Ease of Installation
Location: Kopperston WV
Even touchier throttle response

power increase and even touchier throttle response from top to bottom, my RMZ250 now sounds more like a 450, revs longer in 5th and brings front wheel up in higher gears when needed, very tight fit under side panels but no problem, first after market pipe that I have ever bought that actually gives noticeable power increase with installation, awesome pipe, awesome results

Ease of Installation
Location: Pa
Awesome Exhaust Upgrade for the CRF450R

Awesome Exhaust for New CRF450R ! The sound is better and not as loud as stock minus a few decibels.The power is better and looks sick on bike.

1-4 of 4
Total Questions (3)
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1-3 of 3
scoobydoo2203 Over 4 years ago
Does the comp 4 come with the carbon fiber tip on it on a 2009 crf 450?
Expert MotoSport Staff
Over 3 years ago Location: Portland
Yes, this does have the carbon fiber end cap.
shane195 Over 4 years ago
What is the difference between this and the rs2??
Over 4 years ago
the RS4 is for the new 09 and 2010 Honda's. The picture shown is wrong for and RS4. I told motosport this along time ago when i orders my RS4. On a different note the system is fabulous on a 2009 crf 450r
Top 10 Contributor
Nichro Over 4 years ago Location: Mays Landing, NJ
Is that the correct exhaust in the picture?
MotoSport Staff
Over 4 years ago Location: P+RTLAND
This is just a general product picture supplied by Yoshi. So the exhaust may vary from the picture depending on what bike you have.
1-3 of 3

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