you should check out pdm they got a 240sx thats pushing out almost 200hp on stock internals and dyno chart to prove it...
"ECU tune with cold air intake, header, exhaust and running 104 octane we found 177 RWHP and 182 ft/lbs Torque.
All these numbers were found on the engine with stock internals and 250 000kms on the engine already.