I bought a cheap eBay universal diffuser and some extra plastic sheet. A little cutting, riveting, and "self clearancing" from the exhaust to make it fit. It's far from pretty or perfect, but it's not a huge gap back there.
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Originally Posted by Gunkk
Definitive answers? No. You'd need wind tunnel for that and AFAIK nobody has done that in a 6th gen and published the results.
Theoretically, dead air pockets under the car could increase air pressure under the car, increasing lift and reducing rear-end traction. The car has aero panels for a reason. But at anything under 150mph you're probably OK as long as you have something in place of the suitcase like a pair of A/M mufflers.
I would be more concerned about lift at high speed (1/2+ mile runs, etc.) if the car was straight piped or nascar piped, than worried about sub-100mph drag on a road course track.
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Almost all road courses will be north of 100mph, probably multiple times per lap, but mostly agree with you.
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Originally Posted by Zl1+911
what do you mean by cutouts? thanks
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Man I thought every car guy knew what exhaust cutouts are
Maybe you know them as exhaust dumps?