GKTECH Z34 370Z/V36 SKYLINE REAR SUBFRAME SLIP-IN COLLARS (SOLID)Listing is for: 1x set of solid subframe collars The GKTECH Z34 370z V36 Skyline rear subframe collars are used to eliminate axle tramp and to also tighten up the rear end giving more precise control of the vehicle under harsh driving conditions. The OEM bushes are designed more for comfort than performance and by filling the voids within the factory subframe bushes it makes the subframe much more "as one" with the car. Noise isn't drastically