Statistically, your chances of death, or at least severe injury increase not just proportionally, but in essence exponentially
with every 10 mph increment over 125 mph ( which has been designated as the threshold where a very well maintained sports car
can still be controlled when facing a sudden hazard ). Clearly that chance increases at an even more rapid pace in poor weather conditions , bad roads , roads with inclines or curves, and/or countries where drivers have little respect for driving protocol. I recall reading in one of the car magazines that driving a Bugatti Veyron at 250 mph, on a perfectly paved straight highway in the middle of the desert , without any proximate hazards ( trees, ditches, etc ) or possibility of hitting some critter , and of course with no other cars in sight.. still leads to a 25% chance of death
or major injury to a driver, if ANYTHING whatsoever goes wrong by virtue of either driver fault or car problem, and a little less of a chance for a professional driver, but still ..
So BE CAREFUL out there and if you choose to go 150, 180, or whatnot just as long as you know and come to terms with the risks you're taking, it's entirely your call..