I guess I should have been more clear. I am not legally prohibited from putting a duct in the chin spoiler, it's just that if you put even a 2" tall duct in a 3" tall spoiler, the structural integrity goes to pot. First time you run through the grass, you're likely to rip the whole thing apart. I use the "stock car" plastic, which is flexible and will take off road excursions just fine, but only if you don't cut most of it out for a brake duct.

If my front valance were further off the ground and I had room to run a 6+" tall spoiler, I'd put a duct in the spoiler. But I can't. Maybe I should just raise the ride height by 3 inches in the front to solve the problem?