I have 1" foam (rubber) pipe insulation on the training edge of my hood as a wiper deflector, It also reduces a bit of glare off the hood. I used some velcro to flatten each end. Don't know if it helps with Aero or not, but I like to think so. I have also noticed it seems to have reduced the noise level a bit. Maybe cooler cabin air intake as well, lol...Cheap to try
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