Powertrain aside, the G8 GXP wasn't really designed to go fast in a straight line. Real world performance shows the LS3 GXP only having a marginal advantage over the L76 GT in that department. This car was more about the fun factor, and it was really a Collectors Edition variant of the GT with just a different engine and subtle appearance changes.
Despite having R/T levels of power, the G8 GT was always a Charger SRT8 competitor.
2009 Pontiac G8 GXP
Claimed Power: 415 hp @ 5900 rpm
Claimed Torque: 415 lb-ft @ 4600 rpm
Bore x Stroke: 103.25 mm x 92 mm
Number of Cylinders: 8
Boost Pressure: naturally aspirated
BMEP d: 10.0 bar
VE un-boost: 100.00%
VE boost: 100.00%
MPS @ Peak Power: 18 m/s
Actual Power: 404 hp @ 5870 rpm
Actual Torque: 398 lb-ft @ 4400 rpm
Drivetrain: RWD; 6AT/6MT
Estimated Weight: 4052 lb
0-60 MPH: 5.3 sec
0-100 MPH: 11.2 sec
0-150 MPH: 29.5 sec
1/4-Mile (street): 13.6 sec @ 111 mph
1/4-Mile (drag): 12.7 sec @ 107 mph
Top Speed: 177 mph
Motor Trend Figure-8: 25.6 sec @ 0.80 G
Nürburgring Nordschleife: 7:56
Top Gear Test Track (Power Lap): 1:29
https://docs.google.com/spreadsheets/d/11T6iUr6uQ_TkqqFB1nPvV0malo9X5HgXlK3JZ2du1RA/edit?usp=sharing
