I'm looking at the BBK 1521 complete exhaust system from Summit for $399 and also the Walker 50500 complete system for around $250. Does anybody have any advice on either one of these. Currently I have a good sounding BBK off road H pipe and Flowmaster exhaust with no cats. I bought the car with this setup but to get tags I'll need an exhaust with cats because of emission testing. Any advise will be greatly appreciated.