It has a cold air intake, nos fogger system, t4 turbo, aic controller, direct port nitrous injection and a stand alone fuel management system.... Oh and its driven by a guy who refuses to conform to trivial things like wearing a shirt. Hey i get it OP, i dont put a shirt on unless the Mrs makes me!
Congrats on the new to you S550 and welcome aboard!
Put the stock box back on or a closed CAI, that's garbage.
It's been posted on here numerous times that the S550 stock airbox with a high flow filter is best. An open CAI like that is only beneficial if the car is tracked extensively and can maintain speed/airflow. For a daily driver, that's only drawing in hot air, it's not sealed to the hood, it's a metal tube, and that filter will get quite dirty in time. If you want aftermarket, there's quite a few good closed CAI boxes available now.