Originally Posted by GSi_PSi
Ben, I don't think the exhaust is contributing any power gains by being at 2.25 inch vs VTiR...
Things like bigger cams, bigger intake manifold ,throttle body ,mild port work on intake, 11:1 compression might have something to do with it though lol.
Anyways it doesn't really that much of a difference anyway, as said 2.5 tuned with a tunable ecu will give you more power , and you faggots that negged me in my post earlier show me one dyno on a b series motor where power was actually lost going bigger and I'll eat 10 hats.
It's even been proven 3 inch vs 2.25 inch on a b18c makes more power everywhere this guy has a b18cr motor With just cams , made 10hp extra only thing he did was change the exhaust .
Sam you just said the exhaust isn't contributing that much to power gains - and that it's more to the engine/tune which we can all agree. Why are you suggesting a 2.5 or 3 inch exhaust on a 1.8 with little or no modifications or tune ?
Saying its proven doesn't mean it's actually proven - US are known for inflating numbers and altering dyno readouts and software variables ( for the customers peice of mind and competition!)
A final answer to the OP - if it's a free or cheap exhaust system - go for it. It will be louder , and you will lose a little bottom end and throttle response. You will gain a few kw's in the upper range ( apparently important to most people in this thread !)
So go nuts ! It's your car dude
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