The G8 GXP is very slow and for the money useless to be honest.
Why do you say that? The GXP outperforms the M5 - faster than either Dodge SRT8 product, and certainly faster than the G37 - in any trim. And...it's cheaper than the Challenger SRT8, by about 3 grand.
-Swash
I'm sorry, I can't hear you over the sound of how awesome I am...
2004 IBM/Black/A4 GTO -- 1 of 273 - and the slowest
2002 Galaxy Silver GTP - a few mods - sold