BMS B58 Billet M140i, M240i, 340i 440i intake
The B58 intake is notoriously restrictive. The BMS Billet intake is the answer!
BMS has produced a custom high quality M140i, M240i, 340i, 440i induction kit which removes this restriction and gives a great intake noise.
The BMS B58 intake is also very simple to instal, taking only 10 minutes even for an armature. Simply pop off the top of the air box, remove the OEM panel filter and secure the BMS B58 intake.