may be wrong, but from what I've read on these forums, our year model can take at most a +45 offset w/o any fender mods.
a popular offset size ive seen is +38 on 9.5's and on a lowered car they had to roll/pull rear fenders. I'm guessing for a +30 you might have to roll/pull both rear and fronts if you're not going to do anything fancy with camber adjustments and stay close to stock specs. Then again running a 245/40/18 on 9.5's the tires might be slightly stretched so you might not have to roll/pull the front.
pretty sure more seasoned members will chime in, but thats my 0.02.