54mm or 57mm Exhaust system help

stephens · 01-Aug-2003, 22:44

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 · 03-Aug-2003, 09:23

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 · 03-Aug-2003, 14:14

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 · 03-Aug-2003, 20:11

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

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03-Aug-2003, 09:23	#2
iainzx Registered Forum User Bevel Head Posts: 81 Join Date: Nov 2002 Location: Newcastle upon Tyne Mood: HELL YES !! 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 Reply

03-Aug-2003, 14:14	#3
stephens Registered Forum User Montjuic Posts: 77 Join Date: Jul 2003 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. Reply

03-Aug-2003, 20:11	#4
scoot Registered Forum User Bevel Head Posts: 82 Join Date: Jul 2001 Location: bridport dorset Mood: what mood 54mm system should be ample unless you have got a high state of tune on the engine Reply