The 08 Stangs have reflector HIDs which are inferior to the projector HIDs commonly found on foreign cars (they have a noticeable aspherical optic). You're losing a lot of light through the inefficient reflector design. Overall it wouldn't be a bad idea to shell out $500 for the factory HIDs, but I wish Ford went to a better setup. Even the lowly Mazda 3 and Mazda 6 can be loaded up with projector HIDs.