At 540 horsepower, the high-output version of Ram’s new six is no slouch, serving up performance numbers within striking distance of the old supercharged V8, this per instrumented testing by Car and Driver. More importantly, the RHO drivetrain feels strong pulling away from a stop, or when executing merging and passing maneuvers. While down 162 horsepower from the TRX, the RHO powertrain still ranks as one of the best in the class.