Quote:
Originally Posted by jamze132
A new exhaust seems to be pretty popular so can someone please explain, or point me in the right direction to figure out what the following terms mean?
cat back
axle back
test pipes
x pipes
connecting pipes
Can someone also explain why BMW didn't just put one of these nice after market exhausts on the car to begin with? Thanks!
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simple search
http://m3forum.net/m3forum/showthread.php?t=370927
catbacks/axle backs=muffler and are the first part of the exhaust then comes the xpipe where cats and resonators are found