thanks to those who are offering advise rather than negitivity
ive searched skylines downunder
talked to a few different people
and yes ive also searched google
im not a nissan man hence asking for those with any knowlege or experience as its no definate as this si fro my gf's fathers vl wagon an no its not a vl turbo
he was considering the twincam approach for better fuel economy/power and driveability on open roads where the car will spend most of its time yet has decided to leave it stock now considerign the vague info ive found emans he will have to customise items beyond factory level
once again thannks to those who offered constructive advise rather than negitivity and jumping to assumed conclusions