I've painted bumpers before and just taken the bumpers to a chrome shop to have them stripped. They only charged me $20 per bumper and I picked them up the next day. You could also go with fiberglass bumpers and save a little weight at the same time. It's not like Mustang bumpers do all that much anyway. My car's pretty low so most stock vehicle bumpers are either going to hit my hood or taillights anyway.