Seems kind of pointless to have a limiter to me... I mean if someone is unprepared to go 170+ then it seems likely they're not prepared to go 155 either. Being a grease spot on the pavement at 155 isn't much different than being one at 170. Thereagain, its getting hard to find pavement in suitable condition for high speed unless you go to a track, what with the short shrift government gives to road maintenance these days.
Be safe, have fun!
Greg
Pretty sure the limiter is based on the speed rating of the tires on the car.
With the 1998-2002 Camaro, most of the builds had the tires with the 162 MPH speed rating and that is what the limiter was set at, but you could buy the car with RSA tires on it with a 120 MPH speed rating and that is what your speed limiter was set at.
Some guys would order their new Camaro with painted rims and the RSA tires because they were going to put their own custom rims and tires on the car, but to their horror, they ended up with a 120 MPH limiter as a free gift from GM.