Yes, noticeable difference low-end, and it really starts to wail up in the rev range. Love the sound. I'll be doing the 3.73's next. After a couple of days driving it with the headers, I still "need" the gears.
2014 V6 Auto, black, Performance Package, 102a, Dynotech drive shaft, brakes: Wilwood Superlite (front), adj. panhard; 3.73 gear; Steeda Sport Springs; Steeda sway bar.