Usually they garrett turbo's, smash a hks stamp/badge on it and change rear housing or wheel I believe?
http://forum.teamfc3s.org/archive/index.php/t-34674.html
here are some comments about it though..
another thing to bare in mind is that HKS do not offer parts for rebuilding their turbo's - so if you need to rebuild an HKS, it will be done with standard garrett parts - and wouldnt essentially be a HKS turbo once rebuilt.
hks turbos are only 11% different to a normal garrett they use a different material for there exhaust wheel but cast the same as garrett there comp wheel has an extra blade and the stamp hks on the comp and exh housing they arent that differn
a product only has to be 10% different to market as there own
http://www.nissansilvia.com/forums/index.p...howtopic=104066