Hi There!
I am new to this forum, and I am the proud owner of a 02 Astra Bertone Coupe.
I have had a good look at the design of the exhaust, and the biggest restriction seems to be in the manifold and pre-cat, and after some research I had a look on the Friedrich motorsport website, and found a manifold and sports cat on there part number FMOPFK14. If anyone has a better grasp of German than me, could they take a look and give me some gen?
Or prehaps there is someone else that deals with this outfit other than LMF, as their prices sting a bit!
Here's the website http://www.friedrich-motorsport.de/navi.htm