03 No adapter is required for the BMW Z4. FYI, while they're definitely the brightest I've seen, I'm having flickering issues on startup. I don't get any error messages on the dashboard, but when I start the car they flash for about 10 seconds before turning on fully. This kit comes with a "error free, flicker free" adapter so I'm not sure if there is a solution or not. They've only been in the car for about 24 hours so I'll have to update the durability rating later. Hikari, if you're reading this, I've tried contacting support about a flicker issue, but haven't heard from you guys yet.
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