jumpman2334

make sure you have the right lug nuts for the wheel. its usually the 'tuner' nuts that are 60 degree taper.

what a lot of auto-x'rs use as a rule of thumb:
1.5 x dia of stud = amount of thread/shank you need.

if you buy ARP studs, which i recommend, you will likely need open ended lug nuts because they are super long. the nice thing about this is you now have the option to run slip on spacers (much better/safer than the standard spacers, IMO).

i believe there are other companies who also have extended lugs (ISR comes to mind); that likely arent as long (if you wanna try your luck with keeping your current lugs, provided theyre the right one). but i can guarantee you they will not be as strong as ARP's stuff. if you drop coin on arp studs, dont buy cheap lug nuts either, it will bite you in the ass down the line.

edit:
another thing before i forget. if you get aftermarket studs, check your wheel tq at 25, 50, and 100 miles. if the studs arent 100 % seated when you install, they may seat while youre tq'ing or driving. they can also stretch a little.