I'm looking at picking up some 15's for track use. Curious what backspace people are running out back with their 15x8 welds and centerline wheels with a decent sized DR on them. My old '89 had 15x8's with what I think was 4.5" backspacing, and the 255/50/15 tires rubbed on the fender lips.........wondering if the 5.5" will cause problems if I want to retain the tailpipes on my '93 coupe (quadshocks are already gone). Looking to hear from people who have 15x8's that don't rub, and don't require rolling the fender lips or pounding in the inner wheel well. I'm willing to sacrifice some tire width to achieve this. Thanks for any advice guys.