I just picked up a 2008 Mustang GT for a driver while I am waiting for the '09 Challenger. The Mustang is a nice car for the price and it runs good but..............It doesn't have the power of an SRT-8; period. It will probably be a good comparison to the R/T(as has been said already) but I would still say the R/T will be a little bit quicker. I am going to bolt on a few mods to the Mustang while I wait for the Challenger and see how it responds. One real sore point I noticed with the Mustang is the fly by wire T-body. Ford has it set up slow to respond to pedal inputs and it lacks throttle response compared to a cable. My wife has an '03 GT automatic(cable operated T-body) and it feels a lot snappier than my '08 stick off the line. Once you get underway it's OK. I am going to get a ECM flash that will correct this. I am curious to see how the Challenger will be set up in this area. I will weigh my Mustang at the local scale real soon to see what the reality is and will do the same when I get my Challenger just for comparison's sake. I have to say I am definitely happy to see these cars available even with the gas prices what they are.