my MPH was 92.68 and yes I get the check engine light. I was told it was becuase of the H-pipe. does this rob the car of performance? I put the stock cat pipe back on and the check engine light came bacck on a few days later. Does this mean the cats are bad because it sat all summer? Maybe my o2 sensor is bad. the run was made in 62 degree weather. should I take the screen out of my MAF? Does that help alot?
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