I drove 550km with the taped tilted down spoiler. I held up realy nice. also noticed my rear window had alot less spay on it while driving. And i tought the spray came from under the car. I would think it did change it somewhat at the back. Still thinking of "filling" in the spoiler to roof part with a thin piece of plastic to smooth it out. As to test it. And maybe take some coroplast to lengthen the spoiler.
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