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The JBA Cat4Ward header for 2003–2006 GM trucks with 6.0L LS engines without EGR uses 1-5/8" primaries to improve midrange torque and exhaust scavenging. Constructed from durable 409 stainless with mandrel-bent tubing, it features JBA's Firecone collector, 3/8" machined flanges with oversized ports, extra-thick collector domes, and includes factory-style emission connections with high-quality hardware for a clean, no-leak installation.
JBA 03-06 GM Truck 6.0L LS w/o EGR 1-5/8in Primary Raw 409SS Cat4Ward Header
