I think there's plenty to cram into one film. Dunno about a series..
Start with the people and cars. Show some of the faster cars and what makes them fast, and how the owner did it. Cover the different types of cars. From deceptively quick DDs, to tubbed-out "street legal" racers, to high power sports cars, home-tuned boost buggies, and nimble little racers.
Then show the cars in action. From Drag Racing, to Auto-X, Rally-X, and track days at Mid-Ohio. In-car footage a must. Get together with some of the organizers to get "behind the scenes" footage.
And you can wrap it up with the guys hanging out at a parking lot, like a car-show. Or even something silly like having all these hard-core racers playing around on the go-carts at Magic Mountain.
Though it's CR: The Movie, it doesn't have to have ONLY CR members in it. You can expand it to the things CR members do and enjoy and make it essentially "What to do if you're a car guy/gal in Columbus."
I think the trick will be not to take a Moral High Ground and make it sound like a PSA about illegal street racing. But to assume the viewer knows about street racing and show them the "other side" of CR, where we go balls-out and don't have to give a shit about cops or slow traffic.
I think it's a cool idea, and should be fun.
EDIT: Try to make it like those skiing or surfing movies... GOtta look up the guy's name who makes 'em...