Stainless Works 1-5/8 in Primary Headers with 3 in Collectors & High-Flow Cats - 2003-2011 Ford Crown Victoria & Mercury Grand Marquis (4.6L)

Fits select 2003-2011 Ford Crown Victoria and Mercury Grand Marquis models (4.6L).

Improve exhaust scavenge and flow on your modular 4.6L 2V engine with this Stainless Works header system. These performance headers are engineered with 1-5/8 inch primaries and 3 inch slip-fit collectors, feeding into 2.5 inch diameter lead pipes equipped with high-flow catalytic converters. This design significantly reduces backpressure compared to the restrictive factory manifolds while maintaining a direct-fit connection to the flanged factory exhaust points.

Built for durability and long-term performance, these headers are manufactured in the USA from high-grade stainless steel and are fully TIG welded. This comprehensive kit (MPN: CRVIC03HCAT) includes essential installation components to ensure a professional result without the need for custom fabrication.

• 1-5/8 inch primary tube diameter
• 3 inch slip-fit collectors
• 2.5 inch diameter catted lead pipes
• High-flow catalytic converters included
• Full stainless steel construction, TIG welded
• Direct-fit to factory flanged connection points
• Includes necessary O2 sensor extensions and clamps
• Made in the USA
• Manufacturer Part Number: CRVIC03HCAT