Quote:
Originally Posted by Evice
This tells me that, we need advanced timing/different cams to really use that exhaust.. 5whp is really low for that large diameter exhaust... himms himmss
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huh? he put down 210 on a h0t day with no other real mods, that's +10 or more with presumably stock secondary cats, and stock header with primary cats. that's a SOLID gain
and he never got a baseline dyno, for al we know it could be +15whp on his car
ED: and a stock 135i mufler isn't 3" ID, so it's effectively maybe a 2.5" exhaust, going 3" piping is a waste when it's restricted anyway
so since the standard replacement for the n52 seems to actually be 2.75-3" all the way through, this isn't even a full large diameter exhaust
expect actually few more hp with a proper sized muffler (haha, i'm usually theone saying that mufflers don't do anything! :P)
replace the muffler, new headers with larger/no secondaries, i can't see why another 15-20 wouldn't be seen.