The only low pressure zone on the hood is between the radiator and the carb area.
The windshield is a high pressure zone. Thats why the cars use this area for your A/C, and cowl induction into the carb on 6-'s cars...
On our Mustangs, it is NOT a cooling thing. The reason I got the cowl hood:
1. looks cool (ok, so I had to admit it)
2. weight (but its only like 15# savings, and not a good bang for buck)
3. The cowel lets ar OUT, yes OUT when driving less than 40mph. Also when I park the car (drive it to work), I dont raise the hood when I stop.
4. Its NOT for the high-speed, as air run INTO the engine compartment, and stagnates the radiator air (throughput), and has a worse effect on the radiator, but does aid in getting air over the headers.
If you dont believe me, tape a piece of yarn on the back edge and see at what speed and where the yarn goes!
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