My 06 GTP with the 3.9 had 240hp @ crank when stock and the GXP with the 3.6 has 251hp stock a difference of 11hp stock. With exhaust, intake, and jet stage 2 module my GTP dynoed @ almost 265hp @ crank. I dont know why the GXP did not have the option for a REAL 6 speed manual trans like my GTP.
Straight from Motor Trend:
2006 Pontiac G6 GTP Coupe Performance & Efficiency Standard Features
- 3,880 cc 3.9 liters V 6 front engine with 99 mm bore, 84 mm stroke, 9.8 compression ratio, overhead valve, variable valve timing/camshaft and two valves per cylinder LZ9
- Unleaded fuel 87
- Fuel economy EPA highway (mpg): 29 and EPA city (mpg): 21
- Multi-point injection fuel system
- 16 gallon main unleaded fuel tank
- Power: 179 kW , 240 HP SAE @ 6,000 rpm; 240 ft lb , 325 Nm @ 2,800 rpm
2009 Pontiac G6 GXP Sedan Performance & Efficiency Standard Features
- 3,564 cc 3.6 liters V 6 front engine with 94.0 mm bore, 85.6 mm stroke, 10.2 compression ratio, double overhead cam, variable valve timing/camshaft and four valves per cylinder LY7
- Unleaded fuel 87
- Multi-point injection fuel system
- 16.4 gallon main unleaded fuel tank 13.7
- Power: 188 kW , 252 HP SAE @ 6,300 rpm; 251 ft lb , 340 Nm @ 3,200 rpm
My GTP also has heated leather seats too ralthoff.