The guy I know who has it is on here, type in Toby Brenard's Page under search and go to his page and leave him a message about it. I believe it's heavier, but I don't think they made them heavier then 175 do to there diameter.
I noticed you wanted a pirahna. Well if you want to pay for one, then there is one on ebay. Type this in and you will see it (1st run, Pirahna, bar stamp, disc golf, mint, 171). I have this exact disc and I actually bought it from the same seller. The seller on ebay is Cinn88. You should get it for alot lower then some of these guys are telling you. I have a friend that has a used pirahna in really good shape that would probably sell it for $10 dollars or less, but I do not know the weight. If you want me to find out the weight I will. He is also on discgolfersr.us. If you have any questions just let me know.