Interesting responses.....Lack of empirical data makes this mostly opinion then....So here is my understanding:

I used to race RC cars, specifically Dirt Oval as a sponsored driver, and they are not moving at 150mph, but aero plays a huge affect on handling and stability. A good handling car makes faster laps and generally finishes higher in the standings...Even at relatively low speeds like 30mph....

So when I look at my Duster, it sits higher than my Cuda and couldn't be lowered due to the headers. Now that those are out of the way, I can now lower a bunch.....What the results are, I have no idea.

My plan is to lower it, and put a chin piece on it....and then get it re-scaled and the IC changed if needed..