Sorry, for the delay.
In short, I am planning on doing the tundra setup this weekend. I got calipers (that need rebuilding), tundra rotors, tundra pads and some steel lines I got from wheelersoffroad.com
Tundras/Sequoias had two different types of calipers.
199mm pre-tsb
231mm post-tsb
tsb = toyota service bulletin
Both use the same size rotors but they use different pads. Pre tsb ones had slightly smaller pads. Toyota issued the TSB I believe on the 00 and 01 models and 02 on up had the newer calipers. There is absolutly nothing wrong with the pre-tsb. (I got a used set of those $25 each)
The 199mm calipers are larger than our 4runner/Tacoma calipers (bigger pistons) and allow for a much larger rotor. I picked up my centric rotors yesterday and they are alot heavier than what I remember the 4unners to be. Probably 15 to 20lbs each.
Modifications needed to install the calipers are easy, you need to clip a small piece of metal off the dust shield. I've been told tin-snips will do it.
The 231mm calipers will also bolt on and require the dust shield to be trimmed. But... The people I have read that are doing this are having clearance issues with the stock 16 rims.
If I can get my act together and get them on this weekend I will post pics. To keep everyone happy here is a link for more info.
http://www.yotatech.com/showthread.php?t=50309&highlight=tundra+calipers