I'm going to be doing an exhaust/intake install for the first time, and one question I have is about the bolts...do I need to use loctite, or anything like that for any bolts?

 

If you mean the intake flange bolts, no loctite. But retorque them after a couple of heat cycles. I use metal locking flanged nuts I got from Fastenal, but you can also use star washers or even double them up with a jam nut.
As for the other bolts, use blue loctite.