i find on long maps like road america the muscle cars have the upper hand because they are faster than most other cars, giving them the edge since they are able to take a bit longer to brake and make turns. on short, technical tracks like nurburgring or
laguna seca, the more agile cars can make more use of the corners for advancement. its a give-and-take kinda thing.
I'm pretty sure that what Pirate Duck meant was that taking longer to brake doesn't hurt the muscle cars as much on the "Horsepower" tracks like Road America or Sebring as it does on the short twisty ones like Laguna Seca or Maple Valley.
^^Obviously. Taking longer to do just about anything, is not a good thing in a race. The point is, that they tend to be able to make up for this deficiency with their higher top speed on the long straights.