Engine :
4.4 Liter Supercharged DOHC Varibale Valve Northstar V8
440 horsepower at 6400 rpm and 425 lb.-ft. torque at 3600 rpm
90% of output availble between 2200rpm and 6,000 rpm
100hp per litre
Auxiliary engine oil cooler
Auxiliary transmission oil cooler
Dedicated supercharger radiator

Transmission :
Hydra-Matic 6L80 six-speed automatic transmission
Featureing : Performance Algorithm Shifting (PAS), Performance Algorithm Liftfoot (PAL), and Driver Shift Control (DSC).
Gear ratios:
First: 4.03
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth: 0.67
Reverse: -3.06
Maximum shift speed: 6500 rpm
Final drive: 2.56

Calipers Dual Piston Front single piston rear
Disc Rotors : 13.4in Front 13.0 Rear , lifted from z51 Corvette
Dampening: Magnetic Ride Controll , Cailbrated for the XLR-V
Stiffer Front stabilizer bar
Rear stabilizer bar ,stiffend rear controll arm bushings

Exterior dimentions:
Length (in ): 177.7
Width (in ): 72.3
Height (in ): 50.4
Overhang front (in ): 49.3
Overhang rear (in): 50.6
Wheelbase (in): 105.7

Available Exterior Colors :
Infra Red, Black Raven and Light Platinum

Interior Colors :
Ebony with shale , Zingana Wood ,and aluminium accents.

Misc systems:
AFS, an advanced forward lighting system that is capable of turning the headlamps from straight ahead to 15-degrees inboard and 5-degrees outboard on each lamp.
Magnetic Ride Control
Northstar System

Final Assembly
Bowling Green Kentucky

Further Reading /Sources :