Check out this dyno graph that Keith from APR posted in our B8 S4 forum. This was a recent baseline they ran on their Dynapack four-wheel (hub) dyno and power is 'at the wheels'. Corrective math to accommodate for drivetrain loss can be debated endlessly, but most would agree that 316hp at the wheels suggests that the as-advertised 333hp (usually measured at the crank) is a bit lower than what the car's 3.0T is actually producing. Is it possible the S4 is underrated?