Yes.. a 4 wheel steer system that turns the rear wheels by something like 1 degree (or something of the sort.. please correct if not accurate) to assist in cornering
you can get a HICAS lock bar off e-bay for like $150 and lock the back up as HICAS dosnt really do too much and you can rip out some of the HICAS gear and save weight
Why do you think not?
Do you have a dront diff?
Front drive shaft?
Transfer box?
If you dont know what or how to find these things.. just drop the clutch and see if the tyres light up or just pulls
or you could do it the boring way and see if you have a torque guage on ur instrument cluster..
and yes.. GTS4's are AWD.. not constant like the EVO or WRX.. but as soon as the rear wheels loose traction (the system cheks this 10 times a sec in the R32 and 1000 times in the 33, 34 and staggy), the front wheels begin to pull aswell (hence making it a 4wd).. once rear wheel traction is re-gained.. torque goes back to only the rear wheels.
hope that helps
*I do not advise doing this on a public road*