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Comments On Feb 05, 2015:Decent build quality, lighter than stock. Does not use the Yamaha EXUP valve. I used this muffler in conjunction with a DynoJet fuel injection reprogrammer tuned professionally and it gave the bike better throttle response and more low to midrange power, or so I thought.
After much use commuting on surface streets and some race track laps, I found it too loud for street use, despite its Q label. While it can be acceptable droning at low RPM in a high gear, it is especially obnoxious accelerating.
Reverting to the stock exhaust did not change the throttle response or power delivery, which was improved by the EFI reprogramming, not by the loud muffler.
Basically this thing is a noise maker that shaves a few pounds.
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