VRSF Dual Cone Intake BMW N54 135i 335i 535i Z4 07-13VRSF Dual Cone Intake (DCI) BMW N54 135i 335i 535i Z4 (2007 2013) The factory intake on the N54 is a restriction that costs you power in the mid to upper RPM range where you want it most. The VRSF Dual Cone Intake replaces it with an open air filter setup that flows significantly better, delivers up to 20whp in gains, and gives the N54 an intake note that actually sounds like it is working hard. No permanent modifications required and it can be