When I first contacted Katech in Detroit to have a Stage 2 package performed on my C6ZO6 I asked them what it would cost to have the stock exhaust replaced with a set of long tubes and a catted mid-pipe while they had the car. I was informed they do not install any exhaust parts at their facility. They stated they get visited by the EPA occasionally and if they were caught installing aftermarket exhaust parts they would be heavily fined and could possibly lose their license to do business. So I had a local shop do my exhaust install. U.M.