Fyi
Just a bit of info about the RennZenn car, the front vents are functional. I've sealed up the the floorpan of the bumper cover and added some sheet metal behind the center radiator to exhaust all of the incoming air out over the top. I haven't had the car out on the track to determine if I'm getting real front-end downforce, but I did notice that the temps drop when the car gets going.
Also, the rear trunklid/wing assembly contributed to a significant weight loss. The lid itself is fiberglass, and I was able to remove all of the original spoiler and it's motor. It's not light! Without the hardtop (the soft top and all of it's mechanicals are gone, too) the car is right at 2900 pounds.
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