Originally Posted by Elan

Correct me if I am wrong, but I think there are two different scenarios that are being combined into one. I'd say the first is OP wants to feel the power of his car/show that Mustang who is boss. In that case, downshift ahead of time and get on it. The second scenario would be OP wants to pass a car just drivin on the highway. In that case, yes I'd leave it in D and wait 2-3 seconds for the tranny to downshift. Just how I interpreted it.