Our air dam has been questioned publically in another thread, and on other websites (as somebody pointed out to me). I didn't want to hijack the thread in progress any further, so I started this thread. Ignoring all the insults, here is what is going on with our airdam:
DT doesn't specify anything about airdams, nor does it specify engine swaps either, or streamlining for that matter. In fact, DT rules are a "short" chapter that rely on Gas Coupe for the particulars.
While DT does say all the original body panels must be used, and with the proper orientation, so does Gas Coupe.
It is Gas Coupe that permits engine swaps, and outlaws streamlining for DT, so as far as body issues go, I read that DT = GC unless otherwise specified.
It is Gas Coupe that permits air dams, 5.D.3 para 9 = "Airdams are allowed but shall not cover the original grill opening". But even that is only a partial description, for the full story, you need 4.CC.1 Air Dams and Splitters = "OEM or fabricated devices installed BELOW THE FRONT BUMPER used to inhibit and direct airflow from under the vehicle. Air Dams and splitters can be set inward from the front bumper but cannot extend above or beyond the original contour of the leading edge and sides of the front bumper (see 4.JJ for bumper). Both can extend rearward to the leading edge of the front wheelwell. Splitters are allowed as long as they follow the same contours requirements as an airdam. Bodies cannot be cut away to accomodate airdams or splitters."
These are the rules I followed after asking about it, and after looking at GC entries. I didn't alter the height or width or length of the body, I didn't block the grill, I followed the body and wheel wells, and didn't make any changes that went past the the front bumper contour. I did not alter the front quarter panels, nor did I close up any body gaps, which would be streamlining. And there is a splitter on the bottom that both strengthens the air dam, and splits the air, which is the same contour as the front bumper, but set back. It is a fabricated piece.
That's the way I read the book, and everyone I've asked who is knowledgable about SCTA LSR has agreed so far.