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Bruce, the Kamm on my car is only a photoshop creation, keep meaning to build it, but....
This is why I respect what you're doing by getting out there and doing something.
Keep in mind a pickup drags a parachute/tailgate around, freakin anything can improve it.
Honda has a fairly aero stock car in your 97 Civic, I think the genius in what they do is to shape the c-pillar area and rear glass angles in such a way as to minimize the vortex generation here. By putting the design you have on there, it doesn't follow the template and leaves some odd areas where the relatively high pressure area on the sides of your design are right next to the very low pressure rear window suck area. This is no different than a wingtip on an aircraft and creates a horizontal tornado dragging behind the rear sides of your mod.
Do what you like, I just suggest you fill the back in and stick with the template in what you do.
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