What is your favorite performance muffler?

This is a 440 with tri-y, 2.5" Summit xpipe kit, and summit 2.5" true dual exhaust with turbo mufflers.

1968 barracuda 440 idle.: [ame]http://youtu.be/ly5_JzchmcM[/ame]
1968 440 barracuda idle and rev: [ame]http://youtu.be/eJUOjXq896I[/ame]