Yep, the Aussies must have really liked Infiniti, lol. Funny thing is both were actual knockoffs of the majors. The difference between the 2 sets is the steel used. Piranha says theirs is 301 Carbon Steel. Infiniti's is 431 ss.
Piranha has a huge following in Australia and I believe in Europe. Their Facebook profile has more info up than their website lol!
My friend Jim Battin, owner of Teestar.com carries Piranha. I received this set from him 2 years ago before I got sick. When I was unable to play for a while I didnt want to switch from a trusted set to something new. I'm better now, and I plan on building these after I buy new shafts and make time to do it.
You may see a set of these in my eBay listings too. Jim still has a few and I'm putting his on ebay for him. I think he has both a 4-PW and a 5-PW set.