Again I will interject that we need to see them side by side before you call it a race. And I would like to see a closer match of like components. The long flat torque curve will beat a peak HP curve and so its better to look at those things also. Suspension comes into play more than most know. To just look at HP numbers will not reveal a winner. Thats why we race them side by side. Put your base Mustang GT against a base Challenger R/T and let the tale be told by the tape. My bets on the R/T and if its a 302 top of the line Mustang then run it against the SRT-8 top of the line Challenger. A GT500 is in a league by itself and unless there is a specialty Challenger all by itself they should not be compared as equals. Though I might add that a 6.4 SRT-8 Challenger might give it a good run