I like the flowmaster dual chamber better as far as the 180 sound is i think they sound more throty<sp anyway my air silecer is off my car and if your thinking about it you will have to do some re-constructing first so the air filter will stay on heres a link that will help...
http://www.mustangworld.com/ourpics/fcar/intke.htm
anyway whatever you do dont let anyone tell you you to bore out your stock mass air meter ..I did and i wish i never did..when you punch the throttle it seems to have a miss fire in it ....hope this helps