The Yamaha R1 on the Staintune in-house Dyno managed to achieve a Horsepower gain of 4 Hp over the standard exhaust system. That was measured just with the pipe and no engine modifications. On the road test there was a real torque gain especially in the bikes throttle response, once the throttle was twisted it answered which was most apparent through the mid range.
There is a 3Kg weight saving between standard and the Staintune.
I want to know about the sound:
The Sound is a much throatier note, it’s much louder but still legal and its deeper, all round its sounds sweet.
With restrictor : 93 dba @ 5250 rpm
Without restrictors: : 97 dba @ 5250 rpm
The Yamaha R1 1999 / 2001 is a round can it sounds great and looks great.
It comes in Staintune's world famous polished Stainless mirror finish and you can keep it that way with a bottle of Staintune liquid mirror.
Part No: YA MS R1 99