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      04-05-2012, 03:05 PM   #1
jamze132
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Please explain exhaust terminology - new guy here

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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      04-05-2012, 03:27 PM   #2
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sound. drone. and polution
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      04-05-2012, 03:29 PM   #3
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Oh boy
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      04-05-2012, 03:45 PM   #4
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Use of an internet search engine will yield plenty of results for each term.

BMW did put a nice exhaust system in their cars. People like to individualize their cars. There are also legal constraints as to what is allowed. That deters BMW, but not a lot of owners.
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      04-05-2012, 03:52 PM   #5
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Quote:
Originally Posted by jamze132 View Post
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!
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
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      04-05-2012, 04:15 PM   #6
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      04-05-2012, 06:06 PM   #7
jamze132
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Quote:
Originally Posted by rjd598 View Post
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
Thank you for your help.
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      04-06-2012, 10:07 AM   #8
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I think these terms have some level of variable meaning but here is an attempt:

Cat Back - used to refer to exhaust replacement from the secondary cat to the back of the car.

Axle Back - just the rear exhaust that would then hookup with the stock x-pipe. Many seems to use cat back and axle back interchangeable, but in my mind they are a bit different.

X-pipe - goes from headers to 'axle back' exhaust. This goes under the main cabin of the car and includes both sets of cats (primary and secondary). Most people who replace the x-pipe are doing so to remove the cats and have less restriction.

Test pipes - Probably referring to the Turner test pipes. This is a solution to replace the primary cat without getting a whole new x-pipe. So you cut the stock x-pipe and insert the test pipes in place of the primary cats.

Hope this helps.
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