I'm not personally fond of dual classing, but I'll read any letters to that effect with great interest.
One of the sticky points on some of these cars is that they also have stock HP numbers outside the typical envelope for the class (Civic Si is certainly one in ITA, but there are others to be looked at).
In the end, there is also another factor in *my* mind- if the car works in both classes numbers-wise, where does it "fit"? In the case of the Civic, my feeling is it's a better fit in ITA, but the numbers are such that it seemed better in ITS. When I joined the ITAC, it was actually one of about 10 cars that I "processed" on my own to see where the numbers all were and to get completely familiar with the process math. When the numbers didn't work, I checked the ITAC letter history. If I didn't find it, I asked why, and learned more about the decisions and how they get made.
Personally, I'd like to put several cars out to the membership that are fence-sitters. tGA- you can make fun of me if you desire, but I'd prefer to get member input in more cases. We are an *appointed* body, overseen by another appointed body, who answers to people elected to run the entire club (side note: when typing "run", I mistyped it as "ruin". Freudian slip?). I don't want to bog down the process, but *at least* in cases where we on the ITAC can't clearly see one way or another, I'd prefer the member input process. But, as I said, that's because I'd prefer *not* to dual classify.
To go to the oft-cited nth degree, why wouldn't we dual classify everything? In fact, why not just adopt the system where we post stock hp, process multiplier, and adders for every car for confirmation purposes, and then allow a competitor to pick their own class? I could conceivably run an 83-86 Camarobird in ITS at 3370 (195hp stock, 1.3 multiplier, +100 torque)... Not sure if I'd get the 10.5" front discs to last 20 laps at Summit (let alone other tracks), but hey, that's my problem... Especially since I'm really not sure I'm going to be able to get down to its classified weight in ITR. Please keep in mind this question is NOT meant to be sarcastic by any means, as I'd actually like to know if people think this would be The Way To Go (TM). I would've used my ITB Charger as an example, but there is NO WAY I could legally get the car down to its sub-2000-pound ITA weight...
Final thought- since our statement of class philosphy specifically mentions that dual-classifications aren't part of the plan, then we'd need to run that up the CRB/BoD flagpole for approval, and I for one would sure as heck want member input for that...