K&N - 85-4600 K&N Adapter

These adapters are used with K&N's RD-4600 Universal Air Filter to fit onto Hillborn 2-1/4 In. restrictor stacks. Package includes eight adapters. Manufactured using high quality materials Engineered for performance Fits Hillborn 2-1/4 inch restrictor stacks Made in USA Backed by K&N warranty