I tryed the one chambers on my 420 cubic motor with a 3.5 inch inlet and outlet. (Complete3.5 inch exhust) It sounded stupid. Way to f--king loud!!!! It sounded like I had a door slammer! Not a 9 sec car I was trying to hide. (intention) Went with Dr.Gas 3.5 X-pipe with the spintrap mufflers that would fit a bus! know it still sounds tough and I can work on it it im my garage with out going deaf. (my neighbors stil hate me
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my 2 cents (I am also out of the "how loud can we make it" phase.)