I just traded my '08 Gen4 600hp Viper on my new Shelby 1 month ago.
IMO, Stock vs. Stock 1/4 mile, the Viper's going to win(Except for Driver error). Even with my very limited experience, I managed an 11.88 @ 125, then an 11.44 @ 128 on the next run, and they were the only two times I ever took it down the 1/4 mile. There was plenty left with more seat time too. It's got those HUGE tires out back that make hooking-up much easier than the Shelby, plus it's about 400-500 lighter as well. The Viper is a 10 second car - stock, with some practice.
Anxious to see what the Gen5 will run with the +40 bump in HP & TQ!:rockon: