lol. i called xspeed and asked, and they are like...for an r33, don't use a manual one. you'll blow it up. spikes n stuff, get an electronic one. new HKS for $650, with install and dyno tune $800 all up.
heh... =_= the turbo tech doesn't spike you say? if enough people tell me xspeed is talkin crap, i'll go for the turbo tech.
of course i realise you need to be careful while setting ur boost on a manual. start at zero, and do quarter turns at a time, etc.