The GP is the sporty car, the bonneville is the smooth car with DOHC.
That 5.3 does NOT have the 4t-65... thank god.
Pontiac'* effort to boost the performance image of all its vehicles visits the Grand Prix next. The mid-size four-door will inherit a version of GM'* 5.3-liter V-8, re-engineered for front-drive use, in the new Grand Prix GXP. In this installation it makes 290 horsepower and 325 lb-ft of torque, and is mated to a four-speed automatic transmission. The GXP also gets 12 percent better fuel economy than it would without Pontiac'* first use of Displacement on Demand, technology that shuts off a bank of cylinders under light driving loads. Pontiac pegs the 0-60 time for the GXP at roughly 6 seconds. New styling tweaks, including new front and rear fascias, 18-inch wheels, and new interior trim distinguish the model, for which pricing hasn't been announced. Sales begin in the first quarter of 2005.
255 tires on 18 x 8 in the front, and 225 tires on 18 x 7 in the rear.
dual piston calipers with 12. 7" front rotors is nice (single piston 12.0" rear).
Those tire sizes are a good sign IMO.... Those rotors are HOT, wonder if it'll have tapshift.
EDIT: The LS4 engine is mated to a high-performance Hydra-Matic 4T65-E electronically controlled four-speed automatic transmission with standard TAPShift. The transmission is strengthened to handle the prodigious torque of the V-8 engine.
Whatever works, it better shift better then the 97-current one..