Is a Flowmaster muffler (40-series I think) OK for use behind a N/A 6.2? I know it's not the optimum solution, but I'm gonna need an exhaust system to pass inspection & emissions. Can't (legally...) drive the vehicle in PA without insp. & emiss., so I can't get it to a muffler shop (legally...). Flowmaster is the only company I can think of that has a bolt-on exhaust system for the K5 that's not uber-expensive... so it seems to be a decent solution to the dilema. Opinions?