K&N 57-1521 Performance Air Intake System for 1991-1995 Jeep Wrangler YJ 4.0L I6

Vehicle Fitment

• 1991-1995 Jeep Wrangler YJ (4.0L I6)

Features

• High-density polyethylene (HDPE) rotationally-molded intake tube
• Washable and reusable High-Flow Air Filter™ with oiled cotton filter media
• Oversized, conical design filter for increased airflow
• Heat shield to protect intake air from engine heat
• Easy installation using factory mounting points
• Street legal in all 50 states (CARB EO D-269-22)
• 10-Year/Million Mile Limited Warranty
• Dyno-tested to provide a guaranteed increase in horsepower and torque

Specifications

• Estimated Horsepower Gain: Up to 12.99 HP @ 4800 RPM
• Air Filter: RC-4630, Red, Oiled Cotton Gauze
• Intake Tube Material: High-Density Polyethylene (HDPE)
• Weight: 11.7 lb (5.3 kg)
• Dimensions: 23 in (584 mm) L x 14.25 in (362 mm) W x 12.13 in (308 mm) H

Included Components

• 1x High-Density Polyethylene (HDPE) Rotationally-Molded Intake Tube
• 1x Washable and Reusable High-Flow Air Filter™ (RC-4630)
• 1x Heat Shield
• 1x Set of Clamps and Couplers
• 1x Installation Hardware Kit
• 1x Instruction Manual

Product Description

The K&N 57-1521 Performance Air Intake System is designed to enhance the performance of the 1991-1995 Jeep Wrangler YJ equipped with the 4.0L I6 engine. This system replaces the restrictive factory air intake, allowing for increased airflow that translates to an estimated horsepower gain of up to 12.99 HP @ 4800 RPM. The high-density polyethylene (HDPE) rotationally-molded intake tube is engineered to provide cooler, denser air to the engine, improving throttle response and acceleration.

The system features a washable and reusable High-Flow Air Filter™ with oiled cotton filter media, designed to last up to 100,000 miles between servicing under normal driving conditions. The oversized, conical design allows for increased airflow, while the included heat shield protects the intake air from engine heat, maintaining optimal air temperature for combustion. Installation is straightforward, utilizing factory mounting points and requiring basic hand tools. The K&N 57-1521 is street legal in all 50 states, backed by K&N's 10-Year/Million Mile Limited Warranty.