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Yoshimura RS-4 Full System Exhaust
Yoshimura RS-4 Full System Exhaust

$534.99 - $734.99
5% Off - Save up to $38.69

Item #YSH0004

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16 Reviews
4.8 out of 5 stars
5 Star   15 4 Star   0 3 Star   0 2 Star   1 1 Star   0
All Reviews
Porthos Verified Purchaser
Over 5 months ago Vermont
Looks and sounds excellent!

Cheaper than factory pipe and way more performance. Easy to install, seem durable to withstand the riding we do. I’m happy! Yoshimura baby!! Braapp!!

Jarednator98 Verified Purchaser
Over 6 months ago Bowling green ky
Best pipe for a Suzuki hands down

Looks so good sounds so good adds great low end torque and high end speed also did I say it looks good too because it does.

JoePro127 Verified Purchaser
Over 10 months ago Florida
Yoshimura RS-4 Full System Exhaust

Great fit, looks good, sounds good.

1lowmk5 Verified Purchaser
1 year 5 months ago Sacramento Ca
Great product

I bought this a month ago and threw it on my brand new kx450f looks and sounds great. Needed a USFS spark arrester and came already installed. Fitment is perfect.

Motoboy832 Verified Purchaser
1 year 6 months ago J-Ville Ohio
Gorgeous

This system did not disappoint! Fits like it should, easy to install and looks awesome!! Midrange is noticeably better..

Slipshot426 Verified Purchaser
1 year 6 months ago deep south
Impressive!

I bought this about a month ago and am extremely pleased with performance and quality. I've purchased many exhaust in the past and the build quality of the Yosh system is impressive.

CamUSMC Verified Purchaser
2 years 8 months ago
Would HIGHLY recommend to anyone!

I would highly recommend this exhaust to anyone wanting to get more solid power, better looking, and the sound! Is amazing! I recently compared the FMF 4.1 with my 2012 Rmz250 and the Yoshimura RS-4 and in my opinion for the many years I've raced I would recommend Yoshimura any day over an FMF. Pro circuit and Yoshimura I've both experienced with 2 stroke and 4 stroke bikes and both brands NEVER disappoint! As always love the support and great service of Motorsport.com wouldn't order from anyone else!

Jmarkel475 Verified Purchaser Top 250 Contributor
Over 3 years ago NorthEast

Cant go wrong with Yosh. Best exhaust for hondas 4 stroke moto bikes.

ChrisAtkinson
Over 3 years ago
AWESOME PRODUCT

I love this product it sounds better and performs great! I put this on my YZ250F. I recommend this it's great!

Erik8770 Verified Purchaser
Over 3 years ago Pittsburgh Pa.

Very happy with my purchase from Motor Sport's.

See 6 More Reviews
13 Questions
Answered:   11
Not Yet:   2
Hillbilly
Q: I recently purchased the stainless steel Yoshimura RS4 system for my 2016 KX450 when I got the pipe out of the box I noticed a low-volume insert but not the spark arrestor is it already in the pipe and if it is will it make it louder if I take it out
1 year ago
Bryon
1 year ago
A: It should have come with a low volume insert, and a spark arrestor, mine came with both and an exhaust plug, contact yoshimura, maybe they will send you one. 
Paul
Top 10
1 year ago
A: The Carbon fiber end-cap comes with a U.S.F.S.-approved spark arrested insert installed in the muffler.
508INTHE808
Verified Purchaser
Q: Does this exhaust system come with a header? thanks
1 year 2 months ago
Chris
Q: I own a ktm250 exc f year 2011. Will this rs 4 fit ? as I do not see the available option for it in the drop down list. As most ktm platform are similar. Thanks
1 year 4 months ago
Trevor Gearhead
Top 10
1 year 4 months ago
A: This will not fit your 2012 KTM - We have some FMF, Dr D and Pro Circiut options that will fit
Ryan bullock
Q: Is this system louder than an FMF system on a RMZ 250.
1 year 4 months ago
DaveGearhead
Top 1
1 year 4 months ago
A: No. Depending on packing maintenance, these mufflers will run around 96dB.
WilMo
Q: What increase in horsepower does this create?
1 year 9 months ago
robert
Top 10 Contributor
1 year 9 months ago
A: The power will depend on the tuning with addition of the exhaust, you will generally notice a few horsepower gain.
Mark
Q: I have a 2018 ktm 450 sxf will I need any remapping or any other up date to use this pipe
1 year 9 months ago
David
Top 10 Contributor
1 year 9 months ago
A: Yes it's recommended to remap your fuel/air ratio.
Brian
Q: Accessories
2 years 11 months ago
Honda 2013 CRF250L , is Air Box modification kit and Stay brackets for header pipe heat shield available? Also, is Dealer re mapping / re jetting recommended ?
cody
Q: Come with header?
Over 3 years ago
It says full exhaust system, but says nothing about a header.
MotoSportExpert
MotoSport Staff Expert
Over 3 years ago
A: Yes. Durable high-grade stainless steel tapered header and mid-pipe.
BB101
Q: I have this exhaust for a 2010 crf250r. Will it fit a 2012 crf250r?
Over 4 years ago
MotoSportExpert
MotoSport Staff Expert
Over 4 years ago
A: No the Yoshimura RS-4 Full System Exhaust from your 2010 Honda CRF250R would not fit the 2012 CRF250R.
bil1s
Q: How many db with a yz450f ?
Over 4 years ago
MotoSportExpert
Expert MotoSport Staff
Over 4 years ago
A: Sound For: 2012 YZ450
OEM: 96.0 dBA 99.1 dBA
Yoshi w/ AMA sound insert: 95.8 dBA – dBA - Installed
Yoshi w/ Spark Arrester: 95.8 dBA 98.1 dBA - Optional
1 - 10 of 13
Fitment

See all bikes that this part fits...

See Fitments
# Part Numbers
Product Variant Manufacturer Part #
Enduro / Aluminum With Carbon Fiber End Cap 234700D320
Signature / Aluminum With Carbon Fiber End Cap 228400D321
Signature / Stainless Steel With Carbon Fiber End Cap 399000D520
Race / Stainless Steel With Carbon Fiber End Cap 123500D521
Signature / Aluminum With Carbon Fiber End Cap 263510D320
Signature / Aluminum With Carbon Fiber End Cap 218310D320
Signature / Aluminum With Carbon Fiber End Cap 219200D320
Signature / Aluminum With Carbon Fiber End Cap 262520D321
Signature / Aluminum With Carbon Fiber End Cap 219220D320
Signature / Aluminum With Carbon Fiber End Cap 234820D320
Enduro / Aluminum With Carbon Fiber End Cap 224500D320
Signature / Aluminum With Carbon Fiber End Cap 244710D320
Signature / Aluminum With Carbon Fiber End Cap 228300D320
Signature / Aluminum With Carbon Fiber End Cap 231010D321
Signature / Aluminum With Carbon Fiber End Cap 264610D320
California Proposition 65

WARNING: This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. Wash hands after handling. For more information, go to www.P65Warnings.ca.gov.