Not sure about surprising anybody at the stop lights, just a stock 5.7 from a 05 or 06 magnum. I would imagine the nag1 gearing will make it feel more powerful then it is. I used 3.23 gears out back and intend to run the tallest tire I can get away with. Looking at how close the rear tire on it now (26") is to the front of the opening, I think a 27" is what I'll need to run.