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Installed an air dam on the Focus using the Home Depot edging (now has a different name?). This stuff is not the best material to use...I should have tried to find some heavier pro rubber edging with more substance.
Did it a little different in that I cut off the extra 2 flanges and just used the straight edge...fasted every 6" using pan head SM screws and flat washers. I will eventually paint these black.
The extra flanges made it hard to have a neat installation. Material is still fairly "wavy" in appearance though.
I also put a metal rod inside the hollow area at the bottom to allow shaping the bottom edge some...and this will help hold the center part as the wind hits it.
As far as I can tell I gained maybe 1-2 mpg from this mod.
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Carry on humans...we are extremely proud of you. .................. 
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