I have a question, how do you differ which is the intake and exhaust cam, btw, are apr head studs necessary if the car isnt tuned yet? I have heard stories of people not liking to use them until bigger turbos, etc.

 

headstuds arent necesary, and the ex. cam has an indentation in at the far right. Remember when the valve cover is off, the cam angle sensor goes on the exhaust cam(intake mani=intake cam, ex. mani=ex. cam!).

 

head studs arent needed, yet. but you might as well since youre right there.

 

are new valve springs necessary w/cam upgrades

 

Head studs and springs and retainers are not nessasary. But Im doing them when I do my cams/timing belt