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I have never seen a aftermarket cat-back with a turn down Now if you are talking about true duals with turn downs....then yea i've seen those And yes I recommend true duals with turn downs
The only cat back I have seen with turn down's is the Flowmaster American Thunder System. It sounds good, but does little for gains in HP. Turn downs will not hurt performane one bit.
You can always buy a muffler and then have an exhaust shop weld it up for you and put some turn downs on there. I would suggest a hooker muffler. You can get one for about $100.