i got a 01 a4 with 1.8t and a borla cat back exhaust what would be the best test pipe to use re-using stock o2 sensor locations. any help would be greatley apprciated.

 

if you dont get tested for emissions then get an ATP, or something with the o2 bung already there
if u get tested for emissions, then get a labree high flow cat. and for both you probly dont need to go any wider than 2.5-3"

 

we get tested for emmisions but i get a lick and stick on inspection and emmision since we own a shop

 

oh nice. so then look around for a good testpipe with a o2 bung on it, dont get an ebay one. they may be cheap but they dont have the bung on them

 

http://www.audizine.com/classifieds/...t=4494&cat=all

saw this on AZ thought you might like it