I have a ? regarding them. I am currently running a Flowmaster American Thunder catback with a BBK short offroad pipe and BBk LT's. I was wondering how much louder or quieter this catback will be to my current setup. But more importantly I was wondering if there is any HP/TQ gain from installing this catback. I like the way the flows sound but I need a little more. I aslo know this catback is expensive, But my ? is, is it worth the money. I heard them on a sound file at mustangexhaust.com and they sounded good. Any input on this is well appreciated. Also how do they compare to the SLP loudmouth, Magnaflow, MAC and Bassani catbacks in terms of performance. I know you don't gain much HP/TQ from a catback, but every little bit helps.:beer: