I was just wondering how fast you guys have takin your gxp? "In proper conditions that is" I was also wondering what speed the car seems to become unstable at?

it all depends what kinda tires you have on your car???

I've had mine up at 135-7 a couple times. It has never felt unstable except for shifts under nitrous. Torque steering, under torque, sux. But for flat out driving the car is amazing at high cruising speeds. A member in Germany with the screen name Obis has had his redlined at 146 on the Autobahn.

139 mph before I ran out of room.
It will do 135 in 3rd gear alone.
The colder it is the faster she goes. The first time it went 139 it was 8 degrees outside.

She just clicked to 140 on the HUD when I had to lift for a Benz momentarily for an on-coming car and then I gave him the "German courtesy" of 2 clicks of the "flash-to-pass" feature and gave him a good dose of the pipes under petal-to-the-metal acceleration as I sailed past in the triple digits. Sweeeeeeet!

150 club here jarvis chasing a durham region cop thru your area

that was going by the Garmin GPS so give or take 1 or 2 mph