I just installed these yesterday - took all of 10 minutes total for the set if 4. You don't even have to jack the car up. A couple of notes: first, if you don't have a 7mm socket or wrench, a 9/32" will work. The two are virtually the same size. Second, in the rear there are 3 identical bolts underneath each side, 2 outboard, 1 inboard. You want the inboard bolts. The outboards hold the diffuser to the fascia.
I have not noticed any change in wind noise or fuel mileage with about 100 miles since installing them.
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'74 Stingray coupe, heavily modified, as seen in August 2011 VETTE magazine, 2014 Stingray Z51 #196, ordered 02/11/13, built 08/29/13, Museum Delivery 10/04/13, driven daily!
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