The official from Chrysler was about 5.1 secs, yet in most real life comparisons the SRT-8 got 4.7-4.9secs vs. Ford's claim of 4.9 secs for the GT which has yet to be backed up after all the tests; therefore, a lie by the manufacture as it is making unreliable claims. The suggested 5.3secs is an average for the automatic as I have seen both for the auto, vs. the manual is pretty consistent at 5.1 secs. I was talking hypothetically what you could expect IF the comparison was with both of them using the same type of transmission as it is not logical to compare a manual to an auto when the car featuring the manual can also be equipped when an automatic is available. You should try to compare like transmissions to make things as even as possible to get past the fact that a manual tends to be a more efficient transmission option. The fact is the transmission does matter and the acceleration times you will see between the two on the Mustang and other cars (normally .2 in the 0-60 run).

Some of the reviews I have read for sure with other SRT models including the 300C SRT-8 have stated that they top it out and it was above 165 mph. It depends on whether or not you intend to take it on the track or not. Another thing is if you are wanting to run from the authorities (something I don't recommend trying). The GT500 would be about 5-7 mph faster than the fastest official police cruiser on the market (the Charger 5.7L Hemi version), the Challenger with a rated top speed of over 170 would certainly boost your chances, but ultimately you have to be able to outrun a Motorola which is a difficult task.