JFJ reduces the friction between the outdrive and the dogbone. It increases the efficiency of transmission that is important for Stock class cars. Due to the reduced friction in IFJ the suspension is softer and smoother at car's acceleration and braking.
IFJ set includes:
ST113 - 1pcs
ST116 - 1pcs
ST37X - 1pcs
B415 - 2pcs
PIN01 - 1pcs
SPR07 - 2pcs
Two IFJ sets are needed for one car.