I keep seeing people with different set ups, but mainly some are going with a magnaflow catalytic converter instead of a test pipe, which my turboed vehciles have, that I've seen. Can someone explain the differences?

 

if u live in CA you need your car to pass emissions so you go w/ the magnaflow converter plus its legal. the test pipe sound like $hit IMO and are used by stupid ricers who give hondas a bad name

 

the fact that having a cat makes your car legal and won't smell like poop while other's are driving behind you.

 

So in other words, the test pipe doesnt have the filters for the emissions and to keep the back pressure applied. correct

 

corect?

 

yes correct