For me, I have flow 40's with a mac pro chamber and I wouldn't have it any other way.
Can someone actually explain to me the real problem with flowmasters? I have them on my car and love them, actually i would never waste my money on any high priced pipes like Magnaflow, or borlas. IMO flowmasters, and mac catbacks are the best sounding exhaust on mustangs. But again thats my opinion!