Alex, Hey it's Keith here....I have the setup you are asking about and I'm running the 2.25 exhast just after the cat it is 2.50 thou don't really have any problems except some rattle. other than that it is happy in my option. Keith 84 Rocco -- To subscribe or unsubscribe, send email to scirocco-L-request@scirocco.org, with your request (subscribe, unsubscribe) in the BODY of the message.