My buddy John has put the Yoshimura RS-4 Stainless/Aluminum exhaust through the ringer on his 2013 Suzuki RM-Z 450. Recently I had him ride with the Yosh and the stock exhaust back to back and I asked him some questions to get the info I needed to create this review.
Price: $675.00 from $607.50 on Amazon
Bike: 2013 Suzuki RM-Z 450
Yoshimura RS-4 Stainless/Aluminum Facts
- Made in the USA
- Stainless steel header and mid-pipe, aluminum muffler sleeve
- Comes with 94 db insert installed and 2 meter max insert in box
Thoughts on the Yoshimura RS-4…
Install I was very surprised when the first thing he told was how great the instructions that come with the Yoshimura RS-4 are. The detailed instructions walk you through everything, which is important, because you do need to trim down a couple pieces of plastic to make room for the RS-4. A non-showing part of your rear fender will need to be trimmed to provide clearance for the RS-4’s muffler mounting bracket. The system is designed to help centralize weight, to do so Yoshimura moved the muffler forward. To make room for this move the inside of the right rear number plate needs to be trimmed as well. It also comes with all necessary install hardware and a spring puller to pull the few springs into place. View Yoshimura RS-4 2013 RM-Z 450 install instructions here.
Power The stock pipe on the 2013 Suzuki RM-Z 450 has a lot of hit on bottom and doesn’t rev out very far. The hit on the bottom can make the bike hard to ride. The Yoshimura RS-4 mellows out the bottom end hit, making the RM-Z easier to ride, but doesn’t completely kill it. It makes the RM-Z 450’s powerband strong and smooth throughout. The added top end will allow you to carry a gear longer in many situations. According to John, the added top end is much needed and you will not miss the hard bottom end hit.
Noise The Suzuki is already typically the loudest bike at our private practice spot. After swapping for the Yoshimura RS-4 it was even louder (by a little bit anyway). If you aren’t noise conscious, you will enjoy the mod bike sound the Yoshimura RS-4 provides.
Durability After 50 hours there have been no issues with this exhaust. The packing needed a change at about 35-40 hours, but other than that it has needed absolutely no attention whatsoever.
How did you choose the Yoshimura RS-4 Stainless/Aluminum?
Well, I wasn’t willing to spend $300 extra for the titanium system when it doesn’t offer any performance advantage. I have used Yoshimura exhausts on bikes in the past and had good luck. They always hold up well for me and I like the performance advantage they offer. I think the carbon tip is a nice touch, this also helped my buying decision. The final selling point was seeing the pipe on James Stewart’s bike, I’m a big fan of his.
Would you buy a Yoshimura exhaust again if you had to replace this one?
I definitely would. Like I said above I like the performance increase they offer and have always had good luch with Yoshimura’s durability.