The Mercedes-AMG SL 65 is a peculiar car for aftermarket tuners. Like the BMW M6, the AMG SL 65 isn’t small enough to provide room for enormous tuning potential, but it’s also not up-market enough to not need one in the first place. That’s likely one of the reasons why there aren’t that many tuners who work on the AMG SL 65. Not that it’s the tuner’s fault because if there’s not enough there to work on, why even bother in the first place? Fortunately, a tuner like Vath doesn’t preoccupy itself with asking these types of questions. it just goes ahead and does it. And that’s exactly what we have here with this new tuning program for the AMG SL 65 that gives the performance convertible a higher output of 672 horsepower and 847 pound-feet of torque.