Hey guys im in a little bit of a situation i have a 04 1.8t tiptronic (live in NY city traffic thats why) i want to put a new exhaust and was thinking about a Borla because they are cheap on CarID but did not see a downpipe so would that be something i have to purchase separately and have installed or it wont matter because the borla is a cat back? Also i am considering a GIAC tune to gain some Hp is there anything else i should do to make sure the car is running at top performance?


Thanks