The car that looks the least like the street version is the Charger. Keith
it's not a Charger. It's an Avenger.
The "regular" cars are the Fusion, Charger, Monte Carlo and Camry.
The COT's are the Fusion, Avenger, Impala and Camry.
And I'm with Budro. They've all been pretty much the same since the Ford switched to the Taurus body from the T-Bird and Robert Yates whined about the height of the rear spoiler giving the GM cars (they were running the Lumina and Grand Prix bodies at the time) an aero advantage. NASCAR caved, the rear spoiler got changed, Ford won everything after that, the GM teams whined, Pontiac pulled out and all the templates got "normalized" the next year.
After Jeff Gordon basically bashing in the front of his car on the 48's rear bumper yesterday, I think the aero characteristics are more forgiving with the COT, I think.
I like Big_Rooster's comment too... if they can change the angle of the front and rear wings for a race, let's see 'em at Talledega without restrictor plates. Been a long time since we've seen them at 200mph on a highbank oval, and I think it's time to do it again.
Personally, I think the business with different tracks having a different capacity fuel cell is crap. Make 'em 18 gallons and leave it there. It'd mean less screwing around with the tire compounds and therefore, we wouldn't have to listen to Tony Stewart whine...