I guess I see what the negative absolute was. That is an echo of the Buy a trailer (instead of a pickup truck) thread.
Buy a trailer (instead of a pickup truck) (04-07-2013) -- oil pan 4 -- last post 11-17-2024 08:14 PM
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On the sun visor -- there is a bubble of low pressure air abaft the windshied header. A 45 degree bevel might reduce that, or a comparable curve. Venting the visor probably won't help IMHO.