This is a great exhaust system. I put it onto my 2013 Yamaha YZ250F and the bottom end power increase is very noticeable. I did not mess with my jetting at all and it seems just fine, however I am sure that if I did the jetting I would get even better results. Very simple to put on, I did it in less than 30 minutes. This is my first aftermarket system so I can not compare it with others. I will definitely continue with this brand.
Akrapovic Evolution Titanium Full System Exhaust With Spark Arrestor
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