mk2 gti questions

i recently purchased a 1991 gti 16valve.i intend on installing a kinetic motorsports turbo kit,race bucket seats,short shifter,roll cage,blaunpunkt audio,light tint,new pain,shaved hatch,coil over kit,and 16" bbs wheels.i want to autocross this car.besidres a good coilover kit what else should i invest in????

invest in not investing on a turbo because it is not good for autocrossing. I have a mk3 2.0L turbo and it blows when autocrossing, road racing ok autocross no