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The key is you have to find something cool looking to put into it. I found something on Amazon, looks perfect on the car. I'm telling you all what it is though, I have the only one I've seen on the road (and no, it isn't something tacky like a plate that lights up, just a cool vanity plate)
I am in Tampa, Florida and pretty much have the exact same car minus the air suspension (year, color, etc...). I would LOVE to upgrade to this (mine is a 75D, not a 90D), but I wouldn't have the first clue how to pull off such a thing.