Quote:
Originally Posted by Xaeryan
I would imagine not since it contributes (however small or short-lived) to pollution control, and N54s are therefore limited to rear muffler section changes only in stock class, but perhaps there is a clarification somewhere?
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I doubt it would ever be noticed, but if it was it would be an embarassing disqualification.
Someone who knows their stuff would probably know to look for the secondary cats on a 1M midpipe. There is a reported 5-10hp gain, which is enough to warrant a non-stock designation when swapped.