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fmf powercore 4 muffler

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im posting this for my ride buddy who has an 07crf450r and wants to put a slip on muffler on it,,He does woods riding and i dont know what brands are good on thumpers as i ride 2 strokes.He is leaning towards a fmf powercore4 SLIP ON The question is does he need to rejet? We ride at sea level west australia and stock jetting is pretty good with the stock muffler. Any input into types of mufflers and jetting would be gladly appreciated cheers rob

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Need to chk into a MRD pipe for that bike not much more probably and they can give you the advice you need on jetting it too.

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