Which Flowmaster 40 series is the best?

I wanna put a flowmaster in a 1963 impala (350 V8).


I know the flowmaster super 40 model 9525454(muffler), it's very good! But i saw some car's videos on youtube usign flowmasters 40 series, with a better sound.


I wanna know which is the best flowmaster 40 series, with good sound!


Thanks|||It depends on what kind of sound you want.


loud at idle, quiet at idle, or a lot of rumble when accelerating!


Just ask a good Muffler shop tech and tell him the sound you want and he can help you out!|||Its not just the muffler but dia. of exhaust pipe also. A muffler shop guy would be the best at telling you what combinations give different sounds.