i would have to crunch my numbers for the v6 but for the gt stock with limiter is 137mph and without you can get her up to 182. If you do 2 mods camaro 3.45 rear diff. and cam and i can get her up to 205 mph, but i would suggest lowering her and adding a spoiler, with those 2 she dosnt shake at all at high speeds. fast i have gone was 173 mph- road was 3/4 mile long on a two lane highway before a right bend and it felt like she has a 7th gear after you hit 150mph.
Mods: HID's, New Engine, New Tune, VCM OTR CAI, 1 7/8 ARH to Solo exhaust, Spoiler, Gxp rear defuser, Custom Sound System, Suspension, Brakes, and lowered.