Product Report: 2009 Honda CRF450R Yoshimura RS-4 Exhaust
swapmoto
- November 03 2008
- 8,388 views
- 5 comments
YOSHIMURA RS-4 TI/TI EXHAUST
APPLICATION: All bikes (tested here on 2009 Honda CRF450R)
PRICE: $845
RATING: 9
WHAT IT IS: Thanks to its association with the factory Red Bull Honda Racing team, Yoshimura had a head start when it came time to develop an aftermarket exhaust for the exciting new machine. Yoshimura offers four different versions of their system, ranging from $395 for a stainless steel slip on, all the way up to a $895 top-of-the-line titanium/carbon fiber version. The unit we tested was the ti/ti unit.
HITS: Every Yoshimura exhaust that we’ve ever tested has fit perfectly, and installing the newest RS-4 on the CRF was no exception. The pipe fits beautifully, and the fit and finish of the unit is second to none. Power is noticeably improved throughout the powerband, but the snappy feel and instant throttle response is what we like most about the unit. The biggest gains are felt in the low-end and mid-range as the bike seems to pull a taller gear with greater poise. Thanks to the Duplex Resonance Chamber, which mirrors the stock muffler’s “pre muffler” design, the Yosh system is not much louder than the stock muffler, in spite of maintaining the stock muffler’s diminutive size. We tested with the 99 db insert installed, but the system also comes with an AMA Pro Racing-legal 94db insert.
MISSES: At nearly $900, the Yoshimura system is not cheap! Lucky for most, the $595 stainless steel/aluminum version offers the same performance gains.
THE VERDICT: Any time an all-new bike like the 2009 Honda CRF450R is introduced, aftermarket exhaust manufacturers scramble to produce a good bolt-on system. Thus far, the Yoshimura RS-4 is the best performing system we’ve tested, and we’ve already been able to try out quite a few.
Call 909/628-4722 or visit www.yoshimura-rd.com
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November 3rd, 2008 at 10:31 pm
“produces tons of painfull roost” wormo
November 8th, 2008 at 2:36 pm
Did you have to re-map it for fi? Or does it do it on its own?
December 2nd, 2008 at 10:18 pm
The pipe is nothing but a bunch of hype…It merely makes the bike revs out too quickly and revv to much which creates a jerky response. The stocker is better and smoother than this sucker. Save your money on something that actually works, not that just looks trick.
December 30th, 2008 at 2:01 am
Cycle Guy looks like he has never had a Yoshi pipe. Yoshimura, Akrapovic and Doma make the best pipes available. I have been told that this pipe with a re-map will make the bike hummmmm.
I just orders one!!
February 24th, 2009 at 3:24 pm
the bike will need a new map for this pipe but the great thing about this 2009 bike is that he honda ecu settings for the fuel and ign can be adusted very quick at track side from a laptop it is a great advantage for making changes for better torque,grip and throttle responce for diffrent conditons or track and to suit diffrent rider styles a honda off road dealer will have HRC softwear to adjust the settings and test them on a dyno and then make a few base maps for diffent tracks and conditions that can be saved and remapped before use.if you can get hold of the software beware that its should only be used by trained users as a wrong adustment will easily damage your engine.