Nissan SR20DET Black Top 2.0 litre 16 vavle twin cam turbo engine in rear wheel drive configuration with t25g turbo making 150 kilowatts & 275nm of torque very popular great platform for upgrages capable of making 400kws with correct internal mods, despite all the speculation the s13 redtop sr20 and 180sx blacktop sr20 are the exact same engine with a different colour rocker cover.