I have ecodetuning testpipe, and looking to buy a Milltek Exhaust or APR Exhaust which comes with catback.

my question is,

1)Do I need the catback since I have testpipe?
2)APR and Milltek, which one is more quite?

My car is B7 2.OT Q M

 

Milltek is more quiet. The test pipe gives a lot of gains by it self with the stock exhaust because the stock cat is the most restrictive part of the system. But a higher flowing exhaust helps even more, sounds good, looks good and completes the package.

 

yes you still need a cat back the test pipe take sthe place of the stock cat. A cat back = everything after the cat