i agree with most of you on here that high speeds should be kept to the track.
as paulr33 said redlining is pointless in a stock r33 as peak power is 6400rpm or so from memory
having said that high speeds should be kept to the track if that situation was right on an open road with no trafic where speed limit is 100 i would probly take it to 160 if it seemed fairly safe, any thing over 160 is rediculus on public roads.