Pro Circuit t-4 or FMF Powercore 4 Exhaust

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Jun 1, 2004 | 06:42 PM

400EXtreme03

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Pro Circuit t-4 or FMF Powercore 4 Exhaust

I was wondering witch one would be better to get for a 400EX. Will I need to rejet if i get one? If i have to rejet it, what size should I use for it?

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