I'm just quoting a part of the return policy listed at
http://www.mustangtuning.com/info.html Chris will probably get on here and verify for sure though..
Returns will not be accepted for any of the following: chips and tuners, Diablo Sport and SCT products, custom-order panels and bezels, any custom-order or made-to-order items,
non-defective items that have been used or installed on a vehicle, and body kits. Under no circumstances are mounted wheels (tires on them) returnable. Issues with these items must be taken up directly with the manufacturer.