I have had the same problem on 8+ hour road trips. After about 3-4 hours my lower back starts to hurt. I found a lumbar insert that I slides into my seat and it has a hand pump to inflate/deflate the lumbar support it makes road trips a lot more comfortable.
If you want the website where you can get it PM me.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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