54mm or 57mm Exhaust system help

[stephens]

I've decided to bite the bulllet and replace the Termi asymetrical exhaust system on my 999 with a Termi 2-1-2. There are three sizes available; 50,54 and 57mm.
Has anyone had experience with 54mm and larger exhausts on the 999S, 998S (euro) 998R or 996R?
I am looking to maximize the power under the curve between 6000 and 11000rpm.
(to clarify, I am talking about the area under the curve on a dyno graph).

[iainzx]

I'm sure there was a post on this on the old board somewhere re 748/916/996 and there was some debate about actual gains with larger bores when the rest of the engine was left standard - you mightwant to root it out before you jump

[stephens]

thks iainzx
The 996R, 998S/R and 999S/R all have much larger exhaust requirements than the 916/996. The current racebikes produce max power at 12500rpm and have 62.5mm systems. The 999S properly tuned is still producing peak power at 11500rpm.

[scoot]

54mm system should be ample unless you have got a high state of tune on the engine