Under the condition about no ECU remapping & no engine check light,Only change High flow Downpipe with 200cell sport cats is better than MPE about sound & output ? or must be change all exhaust,Except for the head manifold.I do not want to spend too much money about exhaust to make me a headache........
M2 is not only Downpipe must to change, the midpipe can not be ignored !If M2 owner want to increase the power output and make the exhaust sound more aggressiveness......
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