You probably know this already, but just in case:
The Bug gets its cooling air from the top side of the motor. Either around the engine lid, or through the slots on the rear deck. Once the engine has warmed up the air, it is dumped under the car.
So, unless you have some significant ducting going on that isn't obvious from your image, your nozzles will be for incoming cooling air--not warm exhaust air.
-soD
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