Yep... I have a post in the 87" Yak thread with all the details... best I recall the QP was 8 oz, stock pipe like 4.8 and the Bisson wraparound was 12 or so....

QuietPipe gave 100 rpm more than stock pipe and was VERY quiet.... nice... the Bisson robbed several hundred (like 400-500 rpm) due in part I guess to the swaged exits.

It's fairly short too so doesn't put aby weight behind CG. A big thumbs up over all...