You hit a fuel cut before your redline on RSXs?
But still on most cars I've driven before the wheels would lock up and the engine /would not/ spin faster than its rev limiter if you shifted into 2nd instead of 4th on the highway, you'd just get alot of skid and curse words.
Of course that probably makes them quite alot of money having these tiny hi-rev monsters in the hands of all the kids that get them.