Awesome A-body air dam for under $30!

The real problem is the lack of good performance tires in reasonable 15" sizes! I wanna go back to some lite weight 15x8 wheels instead of my 17s, but I can't find good tires!
I run drag radials on mine , no corner carving. I have never had a problem finding the tires I want, even 13" for an ATV trailer I built.