I have a bully dog on mine. Great chip.
Next truck I send right from the dealer to gale banks and tell him don't send it back without at least 600hp and 1200lbs of torque
Here's an interesting project they did, 735hp, 1300 ftlbs torque, 222mph, 21 mpg, and faster than a vette
http://www.galebanks.com/sidewinder.cfm