I wasn't going to go any lower; I thought I'd read somewhere on here that the lowest recommended by some technical body or the other was 3" above ground. So I figured by going with 4" clearance that I'd be better off. The airdams (which aren't done yet) are in wood and balsa; after the many layers of fiberglass, they'd be pretty strong, but not strong enough to hit anything at speed! BUT, nothing is cast in stone, I can easily go with wheel dams further back, and blend them into the coverage I want to do to fill some of the gap in the wheelwell, which in turn I want to blend into the front wheel boattail. I'd rather throw out my work so far and go with the wheel airdams close to the wheel than bolt something to the car that could damage the car by grounding out too easily.
The back wheels will be getting their own airdams,boattails, and spats. An underbody pan would be a good idea, although I'm moving one step at a time as this is my daily driver.
I put pizza pans on the front wheels and it yielded a 1mpg increase on my 44 mile morning commute. I'll have time this coming weekend to get the rear wheels panned to complete the treatment, to say nothing of looking better
