hks gt800 with stronger internals and fueling are all part of a kit that u can purchase, it costlier but proven to be reliable. gearbox clutch upgrades would complement the engine as well. US based tuners usually have hybrid kits to offer, so its up to you to decide which fits your needs. Tuning a gtr 35 is way different from 'modification' ways of the old and basically all parts are bolt on and fit properly. cant afford to blow an expensive vr38.