My car actually came equipped with a Eurocharged Performance TCU tune. I'd never driven a stock SRT-6 to compare against, but I will say that the car feels "jumpy" and over-sensitive at times. I think a big factor is that my car is also equipped an a Sprintbooster and at times I feel as though the tuned TCU and the Sprintbooster don't play well together. Just my .02.