DeutschTuning proudly offers CTS Turbo BMW S58 G01/F97 X3M/X3MC & G02/F98 X4M/X4MC High-Flow Air Filters. CTS Turbo BMW G01 X3M/X3M Competition and G02 X4M/X4M Competition High-Flow drop in air filters are made to maximize air flow.With increased air flow you will hear and notice faster spool while driving and more peak power up top.