Quote:
Originally Posted by The1
No, the Cat-back starts at the back of the downpipes.
the "cat" in cat-back stands for Catalytic converters if that helps.
a system that includes the downpipes will be called a "turbo back" as it starts at the back of the turbo and replaces everything after it. The turbo back will give you the best gains overall. However, you will be messing with emission controls if you go that route.
the "Cat-back" for your N55 powered car will not mess with any emission controls (you're lucky as the n54 would)
so in order of best gains;
1, turbo back (will void warranty if part is found to be cause of a problem)
2, cat-back (not likely to void warranty, but some dealers are ass holes, if so, be prepared to fight, though this is rare that they are like that.)
3, axle back (not likely to void warranty, but some dealers are ass holes, if so, be prepared to fight, though this is rare that they are like that.)
and yes, a "real" cat-back will be your mid pipes and axle back replaced
It sounds like what you are looking for, for your car, is a cat-back system as it will yield the most power and likely better sound without drastically changing anything that might void warranty.
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Much thanks! This is exactly what I was looking for.