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Mine... 5" wide strips of 18ga. steel bolted to aluminum angle attached to the flat flange under the bumper and fenders. Really stuck this thing down at 140+.
Wonder if you noticed any "drag" increase, since you are running a "limited" class, I guess the only way to really tell in the field would be a coast down test. Every areo trick has a downside, just wondering how much in your case, and would agree whatever it was, its worth it. 
jcc, take your critical crap elsewhere.
The user stated that he liked the result at 140+ mph. If that makes him happy it doesn't matter what the coast down is.
He needed to limit air flow under the car at speed. He got it.
Now, kindly go away.
I'm pretty sure the OP can speak for himself.
Getting a little obsessed are we, or sorry, is that question hitting a little close to home? 
" All sorts of things can happen when you are open to new Ideas" Inventor of Kevlar
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