Expanding from my comments in another thread, I think if you consistently want more entrants, a two class system may be needed. I agree the rules have gotten too complex.
Continuing rules:
Keep the budget rules pretty much as is. Too many people will short-circuit safety if you don't. Getting rid of these rules would probably require more thorough safety checks, and that becomes a time and manpower issue.
Race Class:
Take the current rules, and ditch all the "roadworthy" requirements. Give up any pretense these are street cars. Ditch the "specials" class and allow these cars to compete for the overall win. No more requiring race cars to have turn signals/horns/headlights/etc, though IIRC a brake light may still be required, if I remember my NHRA rules correctly. Heck, keep the current revised rule allowing them to include a welded cage out of budget, but It would be nice if everyone was "encouraged" to track expenses on budget exempt items like cages, brakes, etc., so people could see the real cost of the build.
This would open up things a lot more to maybe some salvage cars people have been skipping over, and maybe bring out some really neat fab work on a tube frame build. In theory, mass-produced cars could eventually get pushed out, but I seriously doubt that would happen for a while. Probably not a lot of people wanting to build a one trick pony that might get clobbered in a mod class back home without putting more cash into it than the challenge allows.
Race-class cars should probably be able to pass an inspection based roughly on what mod class they'd be in in the SCCA, and any NHRA saftey rules, of course.
Enthusiast Class:
This class is for the getting new guys hooked, and maybe building something more radical in the future:
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Car must be road-worthy (and safe) and have a current registration. IOW, lights, turn signals, horn, muffled exhaust that exits the bodywork behind the passenger compartment.
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Must have a full interior (possible exceptions for hatch/trunk carpet, and some missing/broken interior trim). I envision this rule as being enforced by the concours judges. If they think you're breaking the spirit of the rule, you are simply bumped to the race class. No gutting the padding in rear sets, etc. Maybe allow for some interior customization as long as it doesn't look like they're just trying to gut it and drop weight. Allow non-stock seats, but again, let the judges decide intent (I know this is a big gray area). S2000 seats in a Civic, fine. Kirkey aluminum racing seat, uh...no. Probably should allow safely mounted harnesses, since they can usually be in the car in addition to a regular seatbelt.
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Working factory heater, and if the car was so equipped, a working radio in the stock location. (If someone is so weight obsessed they pull 3 out of 4 factory speakers, thats fine, the other interior bits will weigh more anyway)
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TW 200 or higher tires. Or whatever SCCA is going to for stock class in 2014. This allows the buyer to drive down on a set of tires they can compete on. If there will still be a "free" tire exception for a sponsor's brand, thats fine, as long as they are making a decent UHP summer tires. If there are no more "free" tires, this rule might need to be scrapped, since beaten r-comps tend to be cheaper (and easier to find) than decent used summer tires.
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No cages/roll bars allowed. This is two-fold. First, they aren't safe in a street car. Second, they force competitors to try to balance power and handling better when they know a run below 12.50 (or 14.0 in a convertible) will be disallowed at the drags.
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Some sort of "parade" drive required, to make sure the car can run for more than a minute or two at a time without breaking. This could even be done snaking through the overflow parking at the track if we want to keep it off public streets. Besides, slow drives do a great job of revealing inadequate cooling systems. Cars that fail this could get bumped to the race class.
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And the most controversial, no (non-stock for that car)engine swaps. I'd even suggest No "radical" engine swaps instead, but I suspect that would just lead to a lot of B18B powered turbo civics and a lot of arguing over the definition of radical. If you want to put an F2T in an MX-6 that had it as a factory option in that generation (in the US or Canada), thats fine. No jumps in generations or vehicle models.
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You can still trailer it to the challenge. Since you're abusing a cheap car over two days, you can't be sure it'll make the drive home.
If this ruleset was envisioned, judging by the events I've seen in the past, you'd probably see about a 50/50 split between classes, and the race class cars would take the overall win easily. And they should, as a general rule a lot more effort will be put into them. The idea is that new guys, (and some old guys, like me), could build a car we aren't afraid to drive 800 miles and go insane due to noise or other issues with a full on race car, race, and go home afterwards. Maybe some of theose new guys will be inspired to build a race class car.
In the race class, I think most cars would look like the sharp leading edge of challengers now. In enthusiast class, I'd expect a strong concentration of late 80's to late 90's compacts/subcompacts, with a few ponycars and sportscars thrown in.
As a matter of fact, I will make a not-so-bold statement. If a ruleset like this is implemented for 2014, and the apocolypse/hyperinflation/job loss/no vacation time/major health or family crisis/etc does not happen. I will be there in Fall 2014 with a Challenge car.