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I Instaled Headers on the engine and and converted the dual pipe into a single and put 1 cat back in but car feel's slower maybe lack of backpressure does anybody know anything or anybody who knows a proper balance for these engines
It Pulls good till 4thousand RPM than flatens out with no pull at all as if the stock cat is restricting flow maybe it is because origionally it's ment for 3 cylinders to exhaust threw it not all six maybe if I just put on a high flow magnaflow cat will solve my problem somebody in the maxbimmer community must have made a similar setup P.S I do have a PRM intake no chip yet my car must weigh 200 lbs less since I removed the stock setup and it sounds great but slow as hell midrange