Originally Posted by KrzyFast
No, you are fine running a CAI and a 178mm pulley without a tune.
You will need a tune to maximize the benefits of the combo however.
If you run a 181mm pulley, 185mm pulley or run a "stacked combo" 178mm pulley + a smaller supercharger pulley you HAVE to have a tune.
Install your 178mm pulley, with a new crank bolt and enjoy it!
Cheers,
KrzyFast
I asked Rob about the whole new bolt thing, and apparently the stock bolt doesn't achieve full stretch anyways, so there's really no NEED for a new bolt on it.