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I have an Auto Sound Hi Flow Cat in my 86. Can't tell you if it made a difference in performance. I had Flowmasters installed b4 the Hi-flow Cat and they did make a difference. I got the Cat replaced because I had a rattle in exhaust that I thought was the cat. It cost me $289. I still have the rattle. Probably the Y-pipe..... well, it must be, because that is all thats left to replace, ehhe.