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i'll give you an "A" for the concept of deflecting the air around the front tires and a "C" for execution of concept. I've dealt with polystyrene alot (i built tons of plastic model cars growing up) and i have to say it is likely too flimsy to suit your needs in this case. i would suggest finding some 1/16"(1.5mm) Plexiglass to use instead of the styrene. I'm sure the guys on here know of a few other materials you could use. it's a good start for what your looking for and it's a good thing to look at (i'm going to put something similar on the side of the airdam on my Jeep) since it should reduce drag caused by the tires
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