I am about to build a new R33 GTS-T for circuit use only. A loit more serious than i have in the past and will include complete strip out, Breg, comprehensive cage etc.
In the past (2003) i won my class (over 4,000cc road reg) in the WA Speed Event series in a R33 GTS-T. 9 trophies for 9 events in 2003 and some others that we collected along the way.
This was my daily driver road car as well.
All we did was put in a fire extinguisher, harness (only for the Track), king springs and bilstein shocks 25mm lower front and 28mm lower rear.
increased boost to 13psi (note standard intercooler used), K&N filter, sticky bridgestone tyres on standard rims, un plugged HICAS on track days.
This car was dynoed at 297hp at rear wheels and was not the fastest, but often featured in the top 15 outright and embarressed $80k V8's.
One thing we did find out much later with this car was that it had a R33 GTR standard computer in place of the GTS-t one. We have wondered with out proof or research if this helped improved performance!!!
Forgot to add that we also had a turbo back custom 3" exhaust with hi flow cat.