I went to the HP Engineering dyno day today. My max rwhp was 360.57 and torque was 352.79. air to fuel started at 12.7 and then dropped to 12.0 towards the end. When I got home I showed the results to my dad and he told me to go and check the air filter. Half of it is black. So my question is this: Does the dirty air filter explain the air/fuel and how much of a difference would it have made if my air filter was clean?