muffler suggestion?

stock 340 with 1 5/8 hooker headers 2 1/4 pipes no crossover Thrush Super Turbo's
http://www.youtube.com/user/dusters340#p/u/48/XPJdlotmgs4
http://www.youtube.com/user/dusters340#p/u/47/QW8JSuZk-G8