315/35r17 on csprings

315's are a bit of a squeeze, the offset spacing on the deep dish bullits is good, but you may have to modify the exhaust placement. The other challenge is $$ 315/35/17's are a little spendy. I'm going with a 295/35/18 on my rears. And you can get BFG G-Force t/a's for 240$ as opposed to $300+ for 315's.
 
No issues with my cut C springs on 315's. There are "reasonably priced" tires out there in 315 sizes. Yes if you want one of the best,you'll pay but you can get 80% the performance for about 1/2 the price.(My backs cost me about 200$ Canadian or around 140$ american per)