I think if they're forged then you're not supposed to. I don't believe the stock wheels are forged (unless you have an s203), so you should be OK I would think. I had planned to get my stock wheels powder coated as well and that's the best I could come up with. If you ask the people you take it to if there are any problems that could arise I would think they would let you know. If you find out otherwise please be sure to let me know as I will be getting mine powder coated within the next month.