If you have a stick and know what you are doing when shifting you can take on any mustang that is not modded very heavily. One exception: Do not expect to beat the blown 03-04 cobra's that have 390hp stock. You will get smoked. The thing with rice Richard is that most are pretty slow but once in a while you might see a real humdinger like a supra or integra with a huge turbo plus other things and they will spank vettes, vipers, you name it. These are few and far between but they do exist. The thing is it can be hard to tell which one's are the real deal because most ricers are mostly all show and no go. Here is a vid link of a integra with 425whp whipping a vipers ass. Poor viper driver probabbly thought he had that race in the bag.
http://www.revolutionms.com/videos/Vipervstegra.wmv