Answer:
**Stock to limited engine: B-Pipe
**Limited with porting: B-Pipe or Dry Pipe
**Big-Bore with porting: B-Pipe with stinger Mod, Dry Pipe, or Power Factor Pipe
You will be able to find a used dry pipe for cheaper than a used B-Pipe, and the likelihood you find a PFP pipe for any sort of deal is grim...
Depending on freestyle or race, as well as wallet size:
------>Dry pipe will have repeated weld-holding problems if you beat on it in freestyle/free-ride and is prone to a peaky (high RPM) power band.
------>B-Pipe is intended to be reliable and low-RPM based Power Band
------>PFP is intended to let your monster engines breathe while providing a wider potential power-band not possible with other exhaust systems