I'll put up some info and Rob can fill anything I do not cover. The TRD charger was a roots blower style, and the one Rob offers is a centrifugal (sp) type. The way the two work is different but the end result is the same. Personally I am more of a fan of the centrifugal style chargers. Dyno graphs are available at his web site but here are the direct links.
http://www.boostedtundras.com/images/dyno2.jpg
http://www.boostedtundras.com/images/dyno1.jpg
http://www.boostedtundras.com/images/vvtdyno.jpg
Stock the Tundra puts approx. 204HP at the rear wheels.
You can't compair the price difference anymore since TRD does not offer their charger. Your best bet would be to find something on ebay or a forum but they are most likley used and the price will vary with whos selling it and how much they think its worth. In my oppinion the TRD charger was a flop, the power it seemed to show from dyno charts I have seen is pretty poor. I dont have any charts on hand from it but I'm sure with a little digging you could find something. Robs charger looks very good and is probably what I will end up going with. Also if you look at their site you can see a water to air intercooler in development also. I'm kind of in the same boat as Andy (deebsTundra), I'm only 21 but the trucks paid for so hopefully I will be hooking up with Rob for a kit by spring of next year. What I would really have wanted was a turbo but the price of having a custom made set up and the down time on my truck is not feasable. If someone were to further invest in some pistons and rods from Lextreme
http://www.lextreme.com/pistons-rods.html and then throw on a smaller pully then the Tundra would haul. With the addition of an intercooler (especially a water to air one) you could run even higher boost. The biggest problem right now is getting a computer that could control everything. The Unichip only does A/F ratios and such from what I understand. If someone could develop a unit with programable shift points and more user control it would be incredible. Hope that all helps haha I just about wrote an essay here =\
