Thrush makes a great copy of the 40 that sounds really good,Jegs has them,good price to.
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Im running two super 44 flowmasters. First video is with turndowns the second is with it run out the back. I personally think it sounds much better coming out the back.
http://www.youtube.com/watch?v=a18L9I_eG3g
http://www.youtube.com/watch?v=vCuP0xRedqo&feature=mfu_in_order&list=UL
Below is my old setup with dual 3'' flowmaster 40's to the rear with no turndowns
http://www.youtube.com/watch?v=U8xS4EpkSBQ
http://www.youtube.com/watch?v=A5LeaaQt6WY