Kooks 1-7/8in ULTRA GREEN Catted Long Tube Header Kit - Ford Mustang GT / Dark Horse 2015-2026

This Kooks kit pairs 1-7/8 in primary long tube headers with 3 in ULTRA GREEN catted connection pipes and the OEM connection adapters needed to mate back to the factory exhaust on the 5.0L 4V Coyote. Everything is handcrafted from T304 aircraft quality stainless steel, and the 3 in collectors carry the Kooks patented Scavenging Spike that smooths the merge out of the primary tubes. The ULTRA GREEN converters are 4-1/2 in diameter 400 cell units, EPA verified and rated to 850 wheel horsepower, a step above the standard GREEN and H.O. GREEN cats Kooks offers on the same platform. Gaskets, an oxygen sensor extension harness, oxygen sensor spacers, clamps and a bolt kit are included. Kooks has built headers since 1962, every product is dyno and race tested, and these are handcrafted to order in North Carolina.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy