This full-length long tube header replaces the restrictive factory manifolds on classic Mustang 351W small-blocks with large mandrel-bent primary tubes for maximum horsepower and torque across the RPM range. The design is engineered for ground clearance on lowered cars so the collectors stay clear of the ground.

JBA 6616S Build Quality:

• 1 3/4 in. primary tube outside diameter mandrel-bent from 409 stainless steel.
• Patented JBA Firecone collector for smooth merged flow.
• 3/8 in. thick CNC laser-cut flanges for a warp-free seal.
• O2 sensor provisions and oversized exhaust ports.
• For closed course competition use only, not for street/emissions-controlled vehicles.
• Includes gaskets and mounting hardware for a complete no-leak install.