I got a flowmaster dual outlet exhaust system. The stock system comes with a single outlet 3 and a half inch piping all round. However when I got mine installed (the flowmaster Dual) I got the two 3 1/2's going from the headers to a y pipe 2 1/2 inch and through the flowmaster muffler and out to 2 2 1/2 inch outlets. Is this size difference going to slow me down. Please advise me.
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