Thanks' Les. Me too! The point is to allow heat inside the engine room to escape without a lot of fans, ducting etc, The above picture shows a exhaust duct on the Audi that is for a hydraulic fluid cooler. I forgot which hyd system it was for but that is irreverent for my purposes. The point is, this is a spot they choose to exhaust heated air.
I am building this car for track use at least for the first few years. But I also want to build it with a redo for street use in the future. So the heat buildup in the engine room will become a issue to be dealt with at some point. If I do it now it saves me cutting holes into a nice paintjob later.
One of the main the reasons I did this car in the first place was to learn something about a winged aero car. There is a lot of knowledge available on this subject and since I believe in "you can do it with trial and error or do it the way that others have proven, just decide how many times you want to be wrong" I will be using proven techniques to solve problems as I come apron them.
It also would have been a lot cheaper to have just redone my GT40 around slicks and more power. It would have gotten me a bit closer to the front of the fast group which is the objective. The reality is my driving will be the limiting factor more than likely anyway, so this build is really a hobby build. As in, the fun is in the doing.
But thanks for the concern, I have no pride when it comes to pointing out things I could do better. "You would be surprised what you can get done, if you don't have to get the credit".......... R. Regan.