Power Core 4 Help

hey guys and gals i have a fmf power core 4 exhaust for my 1999 yz400f and i would really love to use it, but i ride trails a lot and it does not have a USAF apporved spark arrestor in it, so i was wondering if anyone knew of somewhere i could get one, or even if they ever made them for this pipe?

thanks a lot! Will this fit even the older style power core 4 exhausts, because they dont even sell mine anymore.

I bet it would work, but you should probably call FMF to verify it. :thumbsup:

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