If you have a pa50i, "kit it" because you cannot bolt on exhausts to the cylinder without going crazy and auger bit-ing the exhaust port, and even then its small.
If you have a pa50ii a lot of people just like to bolt on a nice exhaust and maybe reeds and are content with the speed from that.
Peter’s Formula: The Buddy Hobbit
Maybe even notch the variator, throw on a new belt, tension it correctly, grease your rollers, etc?
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Started with a pa50i and I took the kit route, with a nice exhaust, pa50i carb drilled out, pa50ii gofast goodies (intake + reeds + ramp plate)
Insanely fast, Ill have to gps it but right now I'm breaking in my kit slowly.