I just got autoweek today in the mail and when i was reading it i came across one article called "The new supra?"
it features a SRT Lexus GS400 with a TT upgrade, suspension, and tranny upgrades aswell. Its boosting 14psi with 500hp, 515lb, 5 speed auto, and a 0-60 time of 4.25. but what gets me is the article says it has a base price of 70,000. Does Lexus offer this upgrade from the dealership?

no it's privately tuned by SRT. of course lexus wont do these stuff. we already have a hard time to get them boost up their NA engines, let alone putting tt setup man.

Look here for more info/discussion:

http://www.clublexus.com/forums/showthread.php?s=&postid=911099