I'm 45 and experience this in my E92 with sport seats. I own 2 other cars, an SC 400 that I never have an issue in and a Chevy Suburban that sometimes does bring discomfort, but only after longer drive, like over an hour or 2.
In the E92, I find I have to shift my seating position often or the pain becomes rather excruciating. It wasn't a problem when I first bought it 3 years ago, but is slowly becoming worse lately.
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