Quote:
Originally Posted by flinchy
50hp gain sounds reasonable, but it's physically impossible to lower the midrange by THAT MUCH that it would become undrivable... back pressure is bad, period, if anyone says that 'a little is good' they're retarded and wrong
the only downside (well two i guess... ooh make that three) to oversized exhausts is ... excessive noise.. drone (cabin resonance can worsen) and increased (too high even) pollution from exhaust gases.
the high compression ratio of the stock M3 means you literally cannot no matter what unless you REALLY break something (bad tune for example.. or massively oversized cams, but that's a different story entirely), destroy low end drivability... worsen slightly sure, but impossible to totally ruin, will always be in excess of N52 cars at the very least.
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Just to show that I wasn't lying..
spreadsheet of some various e46 M3 exhaust setups.
Check out the Bora midpipe. The Borla isn't anywhere near as extreme as the racing midpipes I was describing, yet even on this (which they consider a street setup),
the torque at 2800 rpm (highway cruising RPM)
goes from 214 (all stock) to 123 with the midpipe. You
absolutely can kill your torque and street drivability with the wrong setup.
The midpipe above is considered a street part still. The mids I was talking about, that people use for race cars (that gain the big numbers) are far, far worse. I can also say that with first hand experience, btw-- I have one of those pipes on my e36 M3 race car (385 hp NA, from the S50B32 (euro spec e36 M3 engine)). It's completely dead below 5000 rpm (not what you'd expect from a 385 hp, 2315 lb car :P).