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some info on improving your mk2f GT, not a comprehensive post so feel free to add you tips these are the quick power gains • high lift cam 264 / 268 / 270 - the biggest gain is made here. dont forget new tappets • 4 branch manifold and exhaust system - dont go to large or it will cost you power • bigger injectors • better air filter • chipped ecu those probably account for 95% of the gain you can get from the engine the next lot help to pull a few extra horses out for those who really want to put the work in: • skimmed head / port matched with inlet / exhaust • de-wedged ported throttle body • lightened flywheel - not really power but will spin the engine up faster. be warned if the fly is to light the crank will wear its bearings in opposition to porting the inlet you can use a NZ/G40 inlet with smaller holes to fill in the gap created by the highlift cam moving the powerband higher above all refresh the electric and cooling systems to have a solid runner