I would say you need to figure out what you plan on doing with your shee before you buy a set of pipes. PT or CPI those are kind of opposites.
Kind of like asking what tire to run. Skat Trak Extreems or Flat track tires. Extreems work well in the sand and flat track tires wont do worth a crap. Flat track tires (american racers) are awesome on a dirt oval but the extreems wont be worth a crap.
Your now not just deciding on a look but more important, how your banshee behaves and runs.
josh