My avatar is of my '01 at the limit. Yours is also restricted to 170 KPH (105.6 MPH) due to S speed rating (180 KPH or 112 MPH) of the OE tires (although for some reason, GM stopped the cars at the R-rating) - although it gets there considerably quicker than my '00 or '01. I once had a '94 Pontiac Sunbird LE V-6 which had T-rated OE tires and was 'shut down' at 112 MPH. All of my vehicles are except the Equinox, which has T-rated tire and is restricted to 190 KPH (and yes, they've all been there).My 1989 camaro...came equipt with 15 " rubber as an option...was goverened to 180 km/h..... which it could almost do in 4th gear before I had to shift ...with the 3.08 rearend. If you had the 16 tires....245/50/16 they ramped it up to 245 km/h...
I think my malibu hit the governor at 180. ...it was very close to that anyways.... 2006 3.5 v6...16" tires....not sure of speed rating.