pipe any good????????/

Not much info out there re: this setup, seems to be some successful competition blasters running them though. Works best with their Bills silencer, highly recommended to run together. THey play nice with stock to slightly modified engines, Affordable though. Price and performance gains are very similar to the FMF, over stock, etc.

As far as jetting goes for that pipe setup, refer here for your blaster:
Bills Pipes - Yamaha Blaster - Jetting Specifications