I am wondering what you guys think of the rear tires at 315/30r21 for the rear? I read an article about a track car (explorer st) that is set up for the track. Has roll cage and setup with 4 seats. They used a 315/30/21 for rear. Wondering if anyone has that size on their rear and if you can offer your expierence with them on the street. Also, wondering what widest set can go on the front without rubbing during turning. All this on H&R lowering springs. I am looking for a very aggressive stance. I like the low look with a little negative camber on wide wheels and large quad exhaust tips, 4" tips.