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who makes a good big bore+porting compatible pipe? i've heard bad stories.
currently have a ptr '98 eliminator pipe on a 87 wondering if it can handle 300+ cc?
and what's the best way to get 300cc straight bore or bore/stroker?
main usage will be sand

thanks for any advice
If you are under or around 300cc's I would say your best bet is a Sparks TT or ESR TRX-5.

Here is a pipe test done by Dave Moore at Dave Moore Racing:
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