I'm currently running 5" of backspacing on my 89 Civic, but that was driven mostly by the rear trailing arm. I'm picking up some new front rims, and since I'm not going to have 4 matching rims, I figured I'd tuck the new ones in as much as I could. So, has anybody gone with more than 5" of backspacing on the front of an EF Civic, and if so, how much?