Kooks Headers 14003300 Stainless Steel GREEN Catted OEM Connection Pipes - 3in.

These pipes provide a direct bolt-on interface, eliminating the need for custom fabrication or additional adapters.

At the heart of these connection pipes are Kooks' signature GREEN catalytic converters — EPA-verified, high-flow cats built on a 400-cell substrate and rated for naturally aspirated or forced induction applications up to 750 RWHP. The GREEN cat's advanced precious-metal coating enables proper catalytic reaction in modern high-output engines while resisting the increased heat loads associated with performance builds.

Key Features:

• 3-inch diameter T304 aircraft-quality stainless steel construction for maximum flow and corrosion resistance
• Kooks GREEN catalytic converters — EPA-verified, 400-cell substrate rated up to 750 RWHP
• Connects directly to Kooks long tube headers and bolts up to the OEM exhaust at the factory connection point — no additional parts required
• Includes all bolts, clamps, and hardware necessary for installation — no welding required
• Mandrel-bent tubing for smooth, unrestricted exhaust flow
• Dyno and race tested for verified power gains
• Handcrafted in the USA
• Backed by Kooks' Limited Lifetime Warranty to the original purchaser, with a 2-year limited replacement warranty on GREEN cats

Kooks Headers & Exhaust has been a leader in performance exhaust manufacturing since 1962, with championship credentials across NHRA, NMCA, NMRA, NASCAR, and more. These connection pipes are a purpose-built solution for Super Duty owners pairing Kooks long tube headers with the factory cat-back exhaust system.

Note: This product is not CARB compliant and is not legal for sale, use, or installation on licensed vehicles in the state of California. A performance tune is recommended to maximize the benefit of this upgrade.