Prothane 6-112 IRS Subframe Bushing Kit for Mustang Cobra

The Prothane 6-112 is a polyurethane rear IRS subframe bushing kit designed as a performance upgrade over factory rubber bushings. Installed at the mounting points between the IRS subframe and the body, these bushings replace the soft OEM rubber that deteriorates and cracks over time, restoring and improving rear suspension precision.

Key Features:

• Polyurethane construction — resists distortion, cracking, and deterioration unlike OEM rubber bushings
• Improved chassis response — reduces subframe flex for tighter, more predictable rear-end behavior
• Available in red or black — both colors share the same durometer (hardness) and performance characteristics; black formulation includes a small amount of graphite to help minimize squeaking
• Includes Prothane pre-lube — proper lubrication at installation is essential to prevent noise and maximize longevity
• Lifetime warranty — Prothane guarantees these bushings against defects in materials and workmanship for the life of the original purchaser's vehicle

A slight increase in NVH (noise, vibration, and harshness) is normal with any polyurethane bushing compared to new OEM rubber; however, the durability and handling benefits make this a popular upgrade for performance-focused builds. The factory metal shells may need to be reused during installation. Always use only the supplied Prothane grease — use of any other lubricant may void the warranty.