Hi all. got 50mm termis fitted. On the odd occasion Ive seen 54mm Termis on Ebay. Any gains to be had by fitting them, or would you guys leave, as is. Thanks again. Ian.
Mood: All that is necessary for the triumph of evil is that good men do nothing
Almost any engine will gain power by allowing it to breath more easily, however there comes a point where it's too much.
I would say that simply fitting a bigger exhaust will increase your power a little, but to see real differences, you need to give the engine some work, not least porting the heads.
I think that you will gain more froma 54mm system because of your engine mods, I'd check with JHP - that's where you had the mods right?
Also, you might run into clearance issues (swingarm) with a 54mm system (mag swingarm!!!! required). You will also need different fueling etc, remapped PC or new chip?