Kooks 1151H432 1-7/8" Stainless Headers w/GREEN Cats for 15-26 Ford Mustang GT

Vehicle Fitment

• 2015-2023 Ford Mustang GT (S550) -- 5.0L Coyote V8
• 2024-2026 Ford Mustang GT (S650) -- 5.0L Coyote V8
• 2024-2026 Ford Mustang Dark Horse (S650) -- 5.0L Coyote V8

Fitment Notes

• Complete header and connection kit -- no additional parts required
• Includes GREEN catted connection pipes with OEM adapters
• GREEN cats rated for forced induction applications up to 750 RWHP
• Dual bolt pattern header flange for S550 and S650 compatibility
• NOT CARB legal -- not for sale or use on licensed vehicles in California
• Headers only (no cats/pipes): 11512402
• Non-catted (off-road) connection kit version: 1151H442
• 1-3/4" primary version: 1151H232
• 2" primary version: 1151H642

Features

• Long tube header design for maximum scavenging and power
• Gains of 60+ HP and 50+ lb-ft to the rear wheels
• T-304 aircraft-quality stainless steel construction
• 1-7/8" mandrel-bent primaries into 3" collectors
• Kooks patented scavenging spike collector design
• 3/8" thick laser-cut flanges for warp-free sealing
• GREEN cats -- EPA-verified 400-cell high-flow catalytic converters
• GREEN cat coating engineered for increased heat in high-HP/FI applications
• OEM adapters included for direct connection to factory exhaust

Specifications

• Part Number: 1151H432
• Type: Long tube headers with catted connection pipes and OEM adapters
• Primary Tube Diameter: 1-7/8" (47.6mm)
• Collector Diameter: 3"
• Flange Thickness: 3/8" laser-cut
• Flange Pattern: Dual bolt pattern
• Material: T-304 stainless steel
• Catalytic Converter Type: Kooks GREEN, 400-cell high-flow
• Catalytic Converter Rating: EPA-verified, up to 750 RWHP
• Manufactured in Statesville, NC, USA

Included Components

• 2x 1-7/8" T-304 stainless steel long tube headers
• 2x GREEN catted connection pipes
• 2x OEM adapters
• Header gaskets
• Oxygen sensor extension harness
• Clamps and complete bolt kit

Product Description

The Kooks 1151H432 is a complete 1-7/8" x 3" long tube header and GREEN catted connection pipe kit for the 2015-2026 Ford Mustang GT and Dark Horse with the 5.0L Coyote V8. This kit delivers gains of over 60 horsepower and 50 lb-ft of torque to the rear wheels through mandrel-bent T-304 stainless steel primaries feeding into 3-inch collectors equipped with Kooks' patented scavenging spike design for optimized exhaust pulse extraction. The 3/8-inch thick laser-cut flanges with dual bolt pattern ensure warp-free sealing across both S550 and S650 chassis generations.

The included GREEN catted connection pipes feature EPA-verified 400-cell high-flow catalytic converters with an enhanced precious metal coating engineered to withstand the increased heat of high-horsepower and forced induction applications up to 750 RWHP. OEM adapters allow direct connection to the factory cat-back exhaust with no additional parts required -- everything needed for installation is included: gaskets, O2 sensor extension harness, clamps, and bolt kit. Kooks has been the leader in high-performance exhaust since 1962, with all products handcrafted at their ISO 9001:2015-certified facility in Statesville, North Carolina. Backed by a limited lifetime warranty to the original purchaser.