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For all you folks who haven't been around here a decade, a couple of companies used to make rear lips for the 2nd gen GS. I had one on my old GS before I put on the l-sportline rear. IMO the are very subtle enhancements and really look a lot like what the OP did with Plastidip.
^ They look good but if they don't serve a function I'd rather just get the factory bumper painted a glossy black or flat black. Maybe that's why they never caught on... I wish there was a matte grey pastidip that would be a nice contrast for darker color GS cars.