To get it looking right you're going to have to go Loooooooooooooooow and that will be your problem. It'll be close to undriveable on anything but the smoothest of tarmac. People who run 13's and go low seem to have a horrible habit of losing sumps on drain covers. Doesn't sound like fun to me!
Gor for some deep dish 14's with a more sensible slam.
Nick