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3,412 Posts
I went with kooks headers and high flo cats with MBRP cat back and picked up 6/10 in the 1/4 but this was on an RT now you already have shorties so im not sure what kind of gains you will have but it will sound beast ... FWIW if you have not changed your cat back yet .. check out the Borla atak its sounds unfknbelvable on a 392