JBA 00-06 Jeep 4.0L 1-1/2in Primary Raw 409SS Cat4Ward Header

JBA is known for making performance exhaust parts that help engines breathe better. If you're looking to get more out of your 2000-2006 Jeep Wrangler's 4.0L engine, this Cat4Ward header is a solid choice. It's designed to be much less restrictive than the factory exhaust manifold, which can lead to improved power and better fuel efficiency.

This header is built from 409 stainless steel tubing, which is a well-built material that holds up well to the demands of daily driving, towing, and even some spirited off-roading. The flanges are a stout 3/8 inch thick with oversized exhaust ports, and JBA uses their proprietary Firecone collector design. This design is based on race-proven technology and aims to maximize power and torque gains in the RPM range you'll use most often. It also includes factory-style emission connections and all the necessary hardware for a professional installation that shouldn't leak.

When installing this header, you'll want to make sure you have the right tools and refer to the manufacturer's instructions for proper fitment and sealing. It's a direct replacement for your stock manifold, but it's always a good idea to check that all connections are secure to get the most benefit from the improved exhaust flow.