a hks gt-rs is it a direct replacment for the stock turbo ???? if it is how much power can i make with basic bolt ons and moderate boost levels????... Also how easily can you make a s13 hatch run low 13's high 12's in the q/m what kinds of mods will i need..oviosly i will need a full turbo upgrade from the stock sr20det turbo........and what are some good turbo's available for the sr20 that i can get my hand son hear in canada???