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What auto-xer's or Track cars have the budget for wind tunnel testing. There are a few tools you can use to figure out if something is having an aerodynamic effect.
The first is a magnehelic gauge to see the pressure difference
Another option is stringing a car
Finally there is paint that people make that will slow dry and wash off when you're done.
All of these can tell you if your parts are making a difference.
I plan on using a boxster to pick up where I left off on my Miata with aero work. I wondered about the scoops as well.
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