The Mercedes-AMG A45 has only been around for a couple of years and yet, it’s already been the recipient of a facelift. That’s what happens when you belong in a segment as competitive as the premium hot hatchback market. As competitive as automakers like Mercedes, Audi, and BMW are, the same holds true for aftermarket tuners, especially those who specialize in any of these three German brands. Such is the case with Posaidon, which is following up the release of its RS850+ tuning kit for the Mercedes-AMG E 63 by introducing the RS450+ program for Mercedes’ resident performance hatch. The tuner claims that it can squeeze out 500 horsepower and 409 pound-feet of torque out of the AMG A45’s turbo four engine, making it one of the most powerful kits for the AMT hatch.