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i know that feeling, sounds similar to my experience while driving with the sunroof open at around the same speed. would think the sunroof would act more like a spoiler for downforce but it just felt... squirrely.
When the sunroof is angled open, it creates a pressure zone that just sucks air into the car. I found that out real quick after adding upward angled dual exhaust. Now, I'm basically killing myself with carbon monoxide poisoning