Its not too different. The stock dyno a/f above was measured at the tailpipe after going thru 2 cats on each side.

Pats a/f was measured with only 1 cat on each side.

The data logs for primary 02 sensor voltage were not that much different between the two cars. Pats was richer than the stock car for sure.

Quote Originally Posted by vr430 View Post
Got it! A completely different approach to tuning between VAG and EVO. Looks like I have to unlearn everything I knew and learn all the new stuff. Well, at least now I know where to get right answers. Thanks!