Good point....don't forget that my weights were without pins or rings, which as Crhis says is not the standard method. I just couldn't be a?$ed opening up the relevant packets but if theres enough interest I might do just that to clear it up. It's a very viable point as pin weight can be dramatically different.
Not sure who makes the TODA pistons Chris, but knowing TODA it wouldn't surprise me if they had their own manufacturing. Remember that all they do is engine parts rather than the jack-of-all-trades HKS. I would have thought it would financially viable for TODA to have their own plant. They could be made be someone else though.....
....hold on, it's just been answered here, unless they are lying...
http://www.todaracing.com/about/technology.html