I have actually ridden in the BullyDog truck ... it's Michael's (one of the owners).
It's a 4 DOOR and it has their 250HP "chip", N2O, Propane, HUGE exhaust, DVD player, etc, etc, etc. It was featured on the TNN show "Trucks" as well.
Very impressive and we went out and did some "testing" on a back road by their shop. Had to do it from a roll, since it'd smoke all four tires from a stop.
Incredible "slam your head into the headrest" type of instant torque! I wasn't prepared for that!
Biggest problem is that the transmission slips and then the PCM cuts the fuel to motor to protect it. He has to roll into the throttle to keep from overrunning the trans.
Phillip (one of the other brothers that own BullyDog) has a Dodge that has been dyno'ed at over 800 HP and has run 12.0x at the track. It too was suffering from transmission troubles when we were there. Seems you can make the HP and then you have to spend the $$$ to beef up the transmissions. Sound familar to the Turbo Buick crowd?