Well this dynomaw muffler in place of the cat has made the exhaust way to loud so I am thinkin about puttin in a high flow cat in but my question on this is I have o2 sim. in, so I dont need a obdII compliant cat correct because i am tryin to save a little money here and that just seems to make sense to me. But I will be running a high flow and 2.5 inlet/outlet and if you got any suggestions than let me know. thanks
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