From the factory, Mercedes AMG vehicles with the US Spec M156 engine are equipped with a mass air flow sensor housing that has a restrictive profile.
Breathe easy with the AWE Tuning 997.2 S-FLO Filter Set
New RENNtech M156 Airbox For Sale
2014 C63 AMG ROW AIRBOX - Forums
Engine Parts for Mercedes Benz 2010 C63 AMG
2014 C63 AMG ROW AIRBOX - Forums
M156 ROW Airbox Set + Weistec High Flow Air Filter Set = $250 +
Mercedes Air Filter Set - aFe 1560940504
Weistec Mercedes-Benz M156 ROW Airbox Set - German Muscle
Weistec Engineering Supercharger for Mercedes Benz M156 Motoren
Stage 3 M156 Supercharger System, C63