4.0L Tubular Exhaust Manifold Kit

The RedRock Exhaust Manifold Kit offers a performance-oriented upgrade for your 1991-1999 Jeep Wrangler YJ or TJ equipped with the 4.0L engine. By replacing the restrictive factory cast iron manifold with a high-flow tubular design, this kit reduces backpressure and improves overall exhaust scavenging for better engine breathing and power delivery. Constructed from CNC mandrel-bent stainless steel, the header features thick flanges that ensure a durable, leak-free connection and an OEM-style fitment. The kit is engineered as a direct bolt-on replacement, providing seamless integration with either your factory exhaust or an aftermarket performance system. Included in the box are the manifold, a new gasket, and the required installation hardware. Installation requires mechanical expertise or professional assistance. The estimated installation time is approximately one day. Please note that this kit is specifically designed for 1991-1999 Jeep Wrangler YJ and TJ models with the 4.0L engine.