Bark too much for bite! Which Muffler?

Thrush Turbos with 2 1/4 pipes no crossover
http://www.youtube.com/user/dusters340?feature=mhw4#p/u/39/XPJdlotmgs4
http://www.youtube.com/user/dusters340?feature=mhw4#p/u/2/QW8JSuZk-G8

Same setup with flowmaster 40's
http://www.youtube.com/user/dusters340?feature=mhw4#p/u/82/IAlJvbn-i7s

Tailpipes may be the answer