can someone pls tell meexhaust pipe radius before the final exhauston B5 chassis A4 1.8T (150HP).

thx...

 

I believe it's 2.17" but I'm not 100% sure.

 

Can someone tell me the exhaust diameter starting from the turbo back? What is the diameter of the turbo opening on a K03 / K04. I want to do a custom exhaust and I've seen test pipes that are 3 inch and some that are 2.5 inch... which is normally better with the stock exhaust and does the 3 inch test pipe go from 3 to 2.5 inch exit diameter?