I've driven R32 GTR's with minor mods, and I've driven a GTiR with minor mods. When I say minor mods I mean an exhaust, a pod and a boost controller... the GTiR gave me a much bigger smile on my face... why? its a 2.0L pocket rocket. Its about as fast as a GTR, but half the size and a smaller capacity engine. It handles like a dream... there's a hint of understeer, but not that bad.
Comparing a GTR to a GTiR is stupid. GTiR's were built to take on Rallies around the world, the GTR was built to take on production class races. Two entirely different kettle of fish, and two completely different builds/racing theories.
Under the 15 year rule we brought in GTiR's for dirt cheap. But now under SEVS it isn't too bad. compliance defintely isn't 6k anyways
Although I must say the GTiR is slightly boring compared to an R34 GTR V Spec II when it comes to driving pleasure but definitely more fun than an R32 GTR. Getting back to the initial question... going from an oversteering R33 GTSt to a slightly understeering GTiR? Once you're comfortable powersliding the GTiR in AWD, you'll never look back.