the headers and crossover are B&G, the rest I made myself: downpipe, cold side, ect (except for the welding of the aluminum which I had a local guy tig weld for me). I do have like (5) 4" mandrel bends if you need any, I got them for very very cheap!!! and might be able to get some more if you need them. Of the ones I have left some are 90 and some are 45. The aluminum bends I got from Darin @ RacepartsSolutions.com (I am sure you know him from TurboForums.com), but you can also use the Ebay stuff. I have a friend that got one of those diy kits and I can tell you that the pieces are really nice, and polished, the couplers and t-bolt clamps are not the best, but they do the job.
The wastegate is a JGS 50mm, mofo is huge (compared to the little Tial I had,

lol!!!)