In Reply to: How good is stock M3 exhaust - what kind is it? posted by Brian on May 11, 1999 at 20:30:17:
: I hear many phrases describing exhausts such as cat-back, freeflow, tri-flow, etc... What exactly do these terms mean.
all exhaust systems have a cat back component (cat short for catalytic convertor)...a cat back exhaust is where all components after the cat are replaced, hance cat back....the exhaust system has to have a certain back pressure for the engine to run properly, the BMW system is a bit retrcitive thereby robbing power, so aftermarket system need to flow better, hance freeflow...triflo is a brand
Also, how good is the stock M3 exhaust (compared to aftermarket - performance-wise) and what "type" is it.
it is a good but it is a compromise between a lot of factors aftermarket doesn't have to worry about
Has the M3 exhaust changed thru models years '95 - '99?
AFAIK, if it has it isn't significant
Would a '97 M3 exhaust for $200 be a good upgrade for a 325i thats got hi-flo air, bilstein/H&R sport suspension, Jim C. chip, M3 wheels and body kit (this is what my 325i has so far).
why do you think the M3 owners upgrade? hmmm? :-)