They both sound good. To me Dynomax sounds more like a race car(not a ricer, but a race car) and the Flowmaster sounds more like a....... Flowmaster. They both sound great though. Much better than stock.
I'm building my own, buying the rear section form advance autoparts for $82 and getting the ultra flo welded muffler because its a straight through fifber pack than a resonance chamber. (very simmilar to a borla muffler) for half the price
i got the 40 series on my 4 cylinder, it sounds pretty good. inside noise aint bad and if your outside you can definitly make peopls heads turn unk:
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