the missus has a n15 sss pulsar (used to be mine). with just extractors, 2" exhaust, with centre muffler and rear muffler (not cannon), and a k&n panel filter and it dyno'd at just over 112hp (about 84kw).
they torque steer a bit in first gear, but are great fun to drive. and will just beat falcons and commodores. you just have to rev them. without extractors they start to choke at about 5500rpm, but with them they come alive and pull hard till redline (7500rpm).
i can't comment on the NA r33, but i think it wouldn't be as fun as the pulsar.
will also add that the pulsars are very reliable.