I have a brand new JET stage 2 (part #20312s) perfromance chip that a friend bought before he knew about the world of laptop tuners. great for someone who just wants some bolt on power! will work with any 6.0 powered gm from 03-06. Sells new for 250+ shipping, will let it go for 175.00 OBO!

Summit info:
JET Performance 20312S - JET Stage 2 Computer Chips/Modules

"Peak performance gains with very little work.

These Stage 2 performance chips/modules from JET will improve the performance of your car or truck with very little work. These chips have been programmed to deliver peak power increases under hard throttle conditions, such as towing and wide-open throttle. They offer a full range of DST programming of the air/fuel ratio, ignition advance, and transmission, and are fully track and dyno-tested to ensure the most possible power without affecting day-to-day drivability. Stage 2 powerchips/modules must use the following for proper performance":

* 180 degree thermostat
* 91 octane or greater fuel
* Free flowing exhaust.

Can also check it out on JET's website for more info!