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

$521.10 - $895.50
10% Off - Save up to $99.50

Item #YSH0004

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13 Reviews
4.8 out of 5 stars
5 Star   12 4 Star   0 3 Star   0 2 Star   1 1 Star   0
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All Reviews
Verified Purchaser
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.

Yoshimura RS-4 Full System Exhaust
Verified Purchaser
J-Ville Ohio
Gorgeous

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

Yoshimura RS-4 Full System Exhaust
Verified Purchaser
Covington, La
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.

Verified Purchaser
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!

Verified Purchaser Top 250 Contributor
NorthEast

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

AWESOME PRODUCT

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

Verified Purchaser
Pittsburgh Pa.

Very happy with my purchase from Motor Sport's.

Honolulu, HI, USA
Solid!

Fits perfect for a 2015 WR450F, easy installation. Great sound and outstanding power. Very responsive, I could keep my front light when needed to on the trails. The exhaust came with a cool Yoshimura plug and some stickers :)

Yoshi
Verified Purchaser
Costa Rica
Badass sound and look, period.

Intermediate vet, rmz250 2015, did one heat with stock, then replaced it with yoshi and did another heat; no gains in time. Had to use a leaner coupler with yoshi, with the stock one was slow.
My impression is the besides the badass look and sound there is very little difference compared to stock; I felt imrovment in hi revv but less low-mid range.
Very easy to set and to remove; I put the stock back and I have the yoshi for sale now.

Verified Purchaser
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

See 3 More Reviews
11 Questions
Answered:   10
Not Yet:   1
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 month 10 days ago
Trevor Gearhead
Top 100
1 month 10 days 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 month 28 days ago
DaveGearhead
Top 10
1 month 28 days ago
A: No. Depending on packing maintenance, these mufflers will run around 96dB.
WilMo
Q: What increase in horsepower does this create?
Over 6 months ago
robert
Top 10 Contributor
Over 6 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
Over 6 months ago
David
Top 10 Contributor
Over 6 months ago
A: Yes it's recommended to remap your fuel/air ratio.
Brian
Q: Accessories
1 year 8 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?
2 years 6 months ago
It says full exhaust system, but says nothing about a header.
MotoSportExpert
Expert MotoSport Staff
2 years 6 months 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 3 years ago
MotoSportExpert
Expert MotoSport Staff
Over 3 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 3 years ago
MotoSportExpert
MotoSport Staff Expert
Over 3 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
scoobydoo2203
Q: Does the comp 4 come with the carbon fiber tip on it on a 2009 crf 450
Over 8 years ago
MotoMoo2
Expert MotoSport Staff
Over 8 years ago
A: Yes, this does have the carbon fiber end cap.
shane195
Q: What is the difference between this and the rs2??
Over 8 years ago
me007
Over 8 years ago
A: 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
1 - 10 of 11
Fitment
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See Fitments
# Part Numbers
Product Variant Manufacturer Part #
Signature / Aluminum With Carbon Fiber End Cap 219220D320
Signature / Aluminum With Carbon Fiber End Cap 234820D320
Signature / Aluminum With Carbon Fiber End Cap 218310D320
Signature / Aluminum With Carbon Fiber End Cap 219200D320
Enduro / Aluminum With Carbon Fiber End Cap 234700D320
Signature / Stainless Steel With Carbon Fiber End Cap 399000D520
Signature / Aluminum With Carbon Fiber End Cap 228400D321
Signature / Aluminum With Carbon Fiber End Cap 225700D320
Signature / Aluminum With Carbon Fiber End Cap 231010D320
Signature / Carbon Fiber With Carbon Fiber End Cap 262511D220
Signature / Aluminum With Carbon Fiber End Cap 263510D320
Race / Stainless Steel With Carbon Fiber End Cap 123500D521
Signature / Aluminum With Carbon Fiber End Cap 244710D320
Signature / Aluminum With Carbon Fiber End Cap 264610D320
Signature / Aluminum With Carbon Fiber End Cap 262520D320
Signature / Aluminum With Carbon Fiber End Cap 242920D320
Signature / Aluminum With Carbon Fiber End Cap 262520D321