If you tune for both, you should be able to run both without a problem. The only physical changes you need to make are the fuel lines... They need to be stainless. Aside from that and tuning, there's not much more to converting to E85. I will DEFINITELY be using it when I go forced induction. I'll already be voiding my warranty, and 105 Octane is nice when you're only paying 2.40/gal!
