I'm wondering what the difference is in between these two test pipes. Is the E code actually worth $100 more? I have heard of the ATP possibly having fittment issues. Let me know if you have any experience w/ these. Additionally i was wondering, seeing as i have a 2.25" Borla system already mounted, how i go about fitting on a 3" test pipe. Thanks as always guys. '98 A4 1.8T QM

 

A testpipe is a testpipe, get the cheaper one. Do you have the borla downpipe?

 

I do have the Borla dp.

 

just get atp 3" from renn-art.com

I have the same car. borla with 3" atp test pipe.

test pipe is just bold on to the borla, no worries.

 

So just for clarification, you can do a straight bolt on with the 3" atp testpipe onto the 2.5" borla downpipe?

 

Not true. The Eurocode testpipe is a 2.5", and the ATP is a 3". 3" is to big.

 

Why is 3" too big?

 

3/17/06

As you can see, it was an easy mistake.

Anyway, size matters so get the 2.5" to bolt to your 2.5" borla dp.

 

3 you will start to loose power with out a BT, thats why i went Ecode

 

I'm confused, Arif, wouldn't you have better flow with a full 3" exhaust system instead of the Borla since you have the elim2871r? Arent you robbing yourself of power?