You can get power pro pipes from RJATV.com or try getting ahold of them direct. I know he had some a little while back.
I have a Toomey but havent had my Blaster running yet...
I have good things about Power Pros customer service also. Meaning that when you buy a pipe from them if you dont like the way it performs they will retune it to the way you want it.
Here is a quote from a member of another forum I am on.
"I called Power Pros, for a quote on a LT250 pipe, The owner Don said he dose in fact make custom pipes for the LT250, and offers a Custom LT500 pipe, he uses his drag pipe but then he tunes it for your application, just might be a good offset to these high end pipes I keep reading about. He quoted both pipes at less than $350.00 each and plated, but suggested until tuned to satisfaction, to leave raw, then he will plate, why has this guy been kept as a secret for so long?"
And another
"I have a freind that went to power pros for an exhaust for his trx310, and they custom tune his pipe, he went out to Pismo and did not like the power curve, then sent it back and they modified it some more, now he swears by power pros, I dont know if they do this for the LT500, FYI but his pipe was under 400 bucks."
With customer service like this you cant go wrong.