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The Cat4Ward header for 2011–2017 Ford Mustang 3.7L V6 uses 1-5/8" primaries to open exhaust flow and boost efficiency compared to stock manifolds. Constructed from 409 stainless with mandrel-bent tubing, it includes JBA's Firecone collector, oversized ports, 3/8" machined flanges and factory-style emission connections plus hardware for a proper, sealed installation.
JBA 11-17 Ford Mustang 3.7L V6 1-5/8in Primary Raw 409SS Cat4Ward Header
