An 11 inch rotor for a 4000 lb car is just asking for trouble. No one would design a system like that anymore. Go visit a car lot and look at 4000 lb cars with 300+ hp engines. They'll all have 13 inch or 14 inch rotors.
Funny you should mention it... Up through '02, the 4,000+ lb Dakota's and Durangos had 11" rotors and tiny, single piston calipers. And it's no secret the brakes sucked on them!
