Due to my wheel size I need to run a spacer. I should take the time to get a hub centric setup though. I've been running the 8mm spacers from AM since I got my wheels and was before on my stockers when I had caliper covers. Zero issues.
http://www.americanmuscle.com/14in-w...acer-pair.html
Granted I only have them on the fronts. Also if you can get 8 turns on the lug you should be fine, which I can get well beyond. However I would not recommend anything more than 8mm. I have a set of 8mm spacers if you ever want to give them a try before you buy.
Let me know.
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Airaid CAI | Borla S-Type Catback | Amsoil 10w30 and MTG Trans. Fluid
382hp 387ft/lb | 1/4: 12.9 @ 112mph