Cold Air Intake for Jeep Wrangler YJ (1991-1995) 2.5L L4 & 4.0L I6 Engines

You love your YJ for its square headlights and its ability to go anywhere, but let’s be honest: the factory intake system is choking that legendary AMC architecture. Whether you are rocking the 2.5L four-banger or the 4.0L High Output inline-six, getting clean air into the manifold is the first step to waking up your rig for the trail or the highway.

Performance Cold Air Intake Upgrade for 1991-1995 Jeep Wrangler YJ (2.5L/4.0L)

If you have spent any time under the hood of a YJ, you know the factory air box setup is far from efficient. It was designed for noise reduction and assembly line speed, not for airflow velocity. The stock system forces air through restrictive baffling and corrugated plastic tubing that causes turbulence before the air even hits the throttle body. On the 2.5L, this makes highway merging a white-knuckle experience. On the 4.0L, it masks the torque potential and the classic induction growl that inline-six owners crave.

This aluminum cold air intake kit replaces that entire restrictive assembly with smooth, mandrel-bent T304 aluminum piping. Unlike plastic which can crack after decades of heat cycles, aluminum dissipates heat effectively and provides a direct, low-resistance path for oxygen to reach your engine. By streamlining the airflow, we help your engine breathe deeper, resulting in sharper throttle response—crucial for modulating power when crawling over rocks or trying to maintain speed on an incline.

Beyond the performance gains, this system cleans up the engine bay significantly. The bulky factory plastic box is replaced by a high-flow conical filter that captures debris without strangling airflow. It is a modification that pays dividends every time you touch the gas pedal, giving your Jeep a throatier sound and the efficiency it has been missing since it rolled off the assembly line in the early 90s.

Why You Need This Upgrade

• Throttle Response: Eliminates the lag caused by the stock corrugated intake tube, giving you instant power when you need it.
• Induction Sound: Unlocks a deep, sporty tone that lets you actually hear the engine working—aggressive under load, but livable at cruise.
• Reusable Filtration: The included high-flow filter is washable. Stop buying paper filters; just clean and re-oil every 50,000 miles.
• Dyno-Proven Gains: Engineered to boost horsepower and torque by up to 10% by maximizing air density and velocity.
• Under-Hood Aesthetics: The polished T304 aluminum piping adds a clean, custom look to your YJ's engine bay.

Installation Notes

This kit is designed as a direct bolt-on replacement for the factory system. Installation is straightforward and requires only basic screwdrivers and socket wrenches to remove the OEM air box. Crucial Step: Disconnect your negative battery terminal before starting. Leave it disconnected for the duration of the install (or at least 15 minutes). This resets the ECU, forcing the computer to re-learn the idle and fuel trim parameters for the increased airflow immediately upon startup. Failure to do this may result in a wandering idle until the computer self-adjusts over several drive cycles.

Replaces These OEM Applications

• 1991-1995 JEEP Wrangler All Model with 2.5L 4-Cyl Engine
• 1991-1995 JEEP Wrangler All Model with 4.0L Inline-6 Engine

*Fits both Manual & Automatic Transmissions

Give your square-body Jeep the breath of fresh air it deserves and feel the difference in every gear.