Is this airdam legal for IT?

[lateapex911]

The body is by gcr definition the OUTSIDE of the car. There is no outside and underside of the "body".

Definition of body says ABOVE the floor pan, well, I'm too lazy to look it up again for the exact wording, but clearly the floor pan can not be above itself. So even though the undertray and floorpan might be in licked by the airstream, they are not part of the body. You can't claim the entire unibody is the body. The body is clearly intended to be the outside shell of the car that was painted to look pretty or get Armor-all'd. Not the grungy bits under the car that hold it together.

Oh, and that would seem to exclude the radiator support which makes the COA ruling so oddly unenlightening.

The part that drives me nuts about the GCR is that it is not clear on cars with integrated bumpers if the wording about attaching to bumper cover is IN ADDITION TO or INSTEAD OF the the attachment to the body. And the COA ruling seems to be designed specifically to not answer that question.

Good point on the floor wording. ANything ABOVE the florpan licked by the airstream is fair game though.

Regarding the mounting. Say I wish to make a nice light splitter, and it needs support at it's mid span. And the most effective splitter would use all the dimensions available in the rules, which puts the area needing support at, oh, say, the bottom of the radiator, or even further back. Tough to attach it to the body in such a location, most would think, right? Not really. I'd weld a tab to the underside of say a header panel (like on oh, say a CRX) and suspend with a cable. Or a thin rod if that seemed better.

[Z3_GoCar]

What about the rules related to the exhaust exit:

Any exhaust header and exhaust system may be used. Exhaust
shall exit behind the driver, and shall be directed away from
the car body. Original exhaust system heat shields may be
removed. A suitable muffler may be necessary to meet sound

control requirements.

Let's see behind the driver, directed away from the car body. Down is away from the car body.