ram air ?

[chaudanova]

There was also some information on one of the forums regarding the placement of the intake side vent, and it's height/position being suboptimal... Perhaps someone remembers this...

[stephen wilson]

The problem with aerodynamic issues, including "ram air", is that there's virtually no way to know if it's working without wind tunnel testing. Going by intuition can sometimes create the opposite of the intended result.

Oh yeah, by definition ram air is ineffective at lower speeds, so that's a non-issue.

[5:04]

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.

[stephen wilson]

True, all of those flow visualization techniques will help, they're just not what I would call definitive. But, you work with what you have!