I have the DSS on my 12 5.0 but I can't differentiate how much of its quickness came from the tune vs driveshaft as I did them at the same time. But it's nice knowing in the back of my mind, when I go FI, it will hold up and not explode while driving. I have no vibration whatsoever, so they are really well balanced.
Also don't forget the DS front safety loop! I got mine from BMR.
LETHAL O/R H, GEN2 OVER AXLE PIPES & GT500's
DRIVESHAFT SHOP ALUMINUM DS W/ BMR LOOP
MGW SHORT SHIFTER
CDC CHIN SPOILER W/ BLACK BILLET GRILLS
BLACK JLT OIL SEPARATOR