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Item #156803
Yoshimura RS-4 Off-Road Full System Exhaust
$810.99 - $1,912.99
$711.99 - $1,912.99
36% off
Yoshimura RS-4 Off-Road Full System Exhaust Item # 156803
Description
The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the AMA 450 Supercross and Motocross Championship series as a rookie in the same year, and again in 2012 with the Yoshimura-backed GEICO Honda team winning both 250 Supercross Lites titles. That same R&D has been directed to developing the current generation RS-4 - a unique design that provides an unrivaled combination of power and a quiet exhaust note. The RS-4 features a Polyresonant duplex chamber, a two-staged stepped baffle and an innovative carbon cone end cap.
Features:
- Pentagonal-shaped sleeve
- Front muffler cap functions as a polyresonant chamber which helps reduce noise
- Two-stage stepped baffle
- Carbon fiber end-cap
- Header and tail-pipe available in Stainless steel or Titanium
Part Numbers for Yoshimura RS-4 Off-Road Full System Exhaust
Fitment for Parts Yoshimura RS-4 Off-Road Full System Exhaust
This part fits the following vehicles:
Reviews
Rated 5 out of
5
by
ScootToots from
The best full exhaust system for CRF250L
Fit and finish is top-notch (with one exception). Performance is excellent. I am super-happy with the RS-4 system.
A couple negatives:
1.) The header mounting plate did not line up with the head stud bolts (had to file-elongate the holes to fit)
2.) The stock low volume insert is difficult to remove and replace with the spark arrestor, and the spark arrestor is difficult to remove for cleaning.
3.) The spark arrestor is much louder (annoyingly loud) than the low volume insert, and diminishes performance slightly.
Some positives:
1.) Yoshi exhausts are tuned with the low volume insert in place, so if you do not require a spark arrestor, the bike will preform optimally with the low volume insert installed.
2.) Bike revs much more freely, and has improved throttle response.
3.) The exhaust note is very throaty, and yet not annoyingly loud with the volume insert in place.
Conclusion:
I love the Yoshi RS-4 Comp Series Full System. The performance and sound is awesome. The spark arrestor however, is not well thought-out.
I absolutely recommend this system, but if a spark arrestor is vital, you might want to explore other options, or modifications to this system.
Date published: 2015-11-06
Rated 5 out of
5
by
CRFguy from
Great fit, awesome sound.
Great fit on the CRF250L. Makes it sound like a dirt bike. Looks good. Remember to order the heat sheild, it does not come with the full system for some reason.
Date published: 2019-08-28
Rated 5 out of
5
by
Moto man from
Night and day
I have rode 3 times since installing the new full system and I’m amazed at the difference it makes. It’s exactly what I was hoping for. It sounds great and and does everything it said it would.
Date published: 2018-05-10
Rated 5 out of
5
by
Penguin sweaters from
Sounds and looks great
Noticeable power increase , sounds awesome, looks sick
Date published: 2017-05-05
Rated 5 out of
5
by
Honda from
Fits great
Fits the crf450rl perfect. With this exhaust and a vortex ecu, this is how the bike should have came from Honda!
Date published: 2022-07-05
Rated 5 out of
5
by
Luke from
Totally impressed
Bought and installed couple days ago, literally took under 10 minutes to remove and replace old system. Fit and finish is nothing short of amazing and when installed with the EJK fuel programmer, it feels like a different bike. Head pipe is much larger than stock and system is lighter also. Can't say enough about how impressed I am with the exhaust from the sound to the performance and even the quality packaging it comes in
Date published: 2021-05-15
Rated 5 out of
5
by
Mike from
Top quality exhaust system
Extremely light weight. Great sound and added performance. Looks amazing! Especially with the carbon tip
Date published: 2021-02-16
Questions
How loud compared to stock
Loud. Go on YouTube to listen to it and don't forget to get a PCV
Date published: 2021-08-04
Does this full exhaust require a re-map after install?
If you are installing the RS4 full system with header and muffler, then yes, you should remap your fueling. You'll be quite a bit too lean otherwise. The power gains come from being able to burn more gas at the right ratios.
Date published: 2017-12-17