-550cc Injectors (TT versions stillen makes them so does RC Engineering)
-Individual throttle bodies 55mm which gives you about a 330mm throttle body overall. (Universal Kit)
-Unorthodox Ultra SS pulleys
-Adj Fuel Pressure Regulator (AEM Univ. Or Nismo Upgrade)
-Stillen Engine Damper (Helps transfer the power to the wheels and also fixes power steering hose kinking problem)
-Weight Reduction, just rip extra interior parts out 300zx's weigh about 3900lbs.
-Larger Intake manifold through street concepts (scpower.com)
-Larger Cams/ Adj Cam gears.
Flash the Ecu or get a Standalone and you should be in about the 400hp range.