I currently have an O/R X-pipe from lethal and I want a little louder then the stock mufflers.. I see on some websites they offer MAC mufflers and magnaflow muffler deletes but they say only for GT, but if u can put gt500 mufflers on a GT why can't u put GT mufflers on a gt500?? Also what kind of mufflers u guys recommend for a car with an o/r X-pipe..???