XPLOSIV

Is there alot of aftermarket parts available to beef up the auto?

Looking at purchasing a Skyline after many years behind the wheel of a commo, so not 100% up to scratch with scene that well. Looking at R33 GTS-T, my question is are the auto boxes any good in terms of handling power? and is the driving experience lost in an auto powered turbo car? (have heard numerous stories over the years that auto boxes are just plain crap behind turbos)