Hi Allen,
I haven't driven it much since I put the plate on. I don't expect to see any change in operating temp. I'd say it's less than a 10% reduction in air flow when the fans are off and probably less than a couple percent reduction when the fans are on. If I ever take it to the track, I'll un-velcro it for the last couple percent.
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2003 Boxster S
1995 Ferrari F355 Spider
San Francisco, CA
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