i have a scorpion GP style pipe on my GSXR... and its unique, every man and his dog out there has a yoshi.
been told it sounds good too.
bit late for the feedback but you could always make an offer to bayside moto, i'll bet they'll prob be keen to offload the pipes after having em on shelf for months.
i know it's late but some guys over in US run them on there track bikes and with 2 scorpion slip ons + pcIII and filter they were getting 170-172bhp. keep in mind that it is america and i not sure of the dyno quality.
Chariot of Fury 50cc 2stroke Race bike Team Gumby in red SAM & SRT Survived