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actually you can buy the high flow cat seperate and I heard that solo can fit too. As far as the comparison between kook and obx quality the kook is a better quality but ARH is better than kook and BBK is better than doug thorley. There's no ending. Only thing that matter is that they all are either stainless or ceramic and have about the same gain as what a long tube are suppose to give you. They are all tested and dynoed, just look at the v8 guys.
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