Performance wise I guess that 426 HP compared to the 425 HP is better. Can't argue with numbers... 1 HP is 1HP. I just wish they (Car Mags) would actually compare an SS and an SRT-8 on the same day and same place to really compare the two. We have a little more weight but much better gearing. I weighed my R/T on the scales at Z-Max Dragway and with me in it and 1/2 a tank of gas 4108 lbs. I weigh 180. So please tell me where all Challengers are over 4000 lbs. as I have read in every Mag. printed. So until I see an actual SS vs. SRT-8 we will have to live with what the magazines say and give the nod to the SS @ 1 HP performance advantage. I'll just settle it on the street.