1.if i brought a 2.5' TT downpipe and borla exaust system which is 2.25' whould them bolt on to each other or is it good to bolt them together???


2. i am going to buy a chip for my car but what is the diffrence between normal chips and the x-chip????

 

1. wut do u mean by TT

2. wut year is your car cause i beleive the X-chip is only for the 2001 A4s
and it runs on higher boost

 

ATPTURBO.COM downpipe there works on at stock exhaust (bolt on right where the flex pipe is) So you can use any aftermarket exhaust system with it. Just an option for you. Id go with 2.5".

 

1. Not sure if they'll bolt together but you can make them work together.
-Is it bad? Not necassarily, it's still an upgrade. But if you're already spending the money, spend the extra and get a 2.5" exhaust, that way it doesn't bottleneck and reduce your gains.

2. I have no clue, I have a 2.8 and wasn't planning on chipping it. Search for info on chips and which one would suit your car best.

 

audi tt downpipe and my car is also 2001 a4

 

I don't think the TT DP will bolt up. i could be wrong though