BMW 3 Series E90, E91, E92 & E93 (2005-2013) Transfer Case Bush Insert (Tuned/Track) - PFF5-1526P PFF5-1526P Transfer Case Bush Insert (Tuned/Track) is made from our signature Purple 80A material to restrict movement further for Tuned Petrol/Tuned Diesel vehicles and occasional track use. 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!