with a v-spec gtr33 you pull the fuse out in the boot and the drive-shaft for the transfer diff, with a 32gtr and 33gtr non v-spec just the fuse comes out. you will see when you put the car on the dyno and start rolling the HICAS light will come on and then you know its working. dont trust hks split tourqe controlers cause the car will still grap on the dyno.