BMW 3 Series E90, E91, E92 & E93 (2005-2013) Transfer Case Bush Insert (Motorsport) - PFF5-4628BLK PFF5-4628BLK Transmission Case Bush Insert (Motorsport) is made from our stiffest 95A Black Series material for Motorsport use, providing a no-compromise performance option for track-focused builds. An increase in NVH, usually at idle, should be expected when stiffening the mount between the transmission and chassis. The harder the material, the greater the NVH transmitted. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!