Confirm fitment with the part number before ordering.
Product information
Manufacturer information. Check the part number and installation requirements for your vehicle.
Supplier details checked 2026-09-23 · Test catalog
Product description
2015-2026 Mustang GT/Dark Horse 5.0L 4V 1-7/8in. x 3in. Headers w/ULTRA GREEN Catted Connection Pipes and OEM Adapters. Includes Gaskets; Oxygen Sensor Extension; Clamps; Bolt Kit and O2 spacers. No additional parts required.
2015-2026 Mustang GT/Dark Horse 5.0L 4V 1-7/8" x 3" Headers w/ ULTRA GREEN Catted Connection Pipes and OEM Adapters. Includes Gaskets, Oxygen Sensor Extension, Clamps, Bolt Kit and O2 spacers. No additional parts required.
1-7/8" SS Headers & ULTRA GREEN Catted Connection Kit. 2015-2026 Mustang GT/DH
1-7/8in. SS Headers/ULTRA GREEN Catted Connection Kit. 2015-2026 Mustang GT/DH
Features
Manufactured In The USA. Kooks Uses T304 Aircraft Quality Stainless Steel. Kooks Products are Backed by a Limited Lifetime Warranty To the Original Purchaser. Kooks Products Are Dyno And Race Tested and Designed For Maximum Power.
Kooks Headers And Exhaust Make The Most Power In The Industry
Kooks System Are Specifically Designed For Maximum Power
Kooks Products Are Made Of T304 Air Craft Quality Steel
Limited Lifetime Warranty To Original Purchaser
3 Generations Being Family Owned And Operated
Every Kooks Product Is Dyno And Race Tested
Kooks Products Fit And Install The Best
100 Percent Manufactured In The USA
Manufacturer application notes
2015-2026 Mustang GT/Dark Horse 5.0L 4V 1-7/8" x 3" Stainless Headers w/ULTRA GREEN Catted Connection Pipes and OEM Adapters. 304 Stainless Steel Construction 3/8" Thick Laser Cut Flanges1-7/8" Mandrel Bent Primaries3" Collectors with Kooks' Patented Scavenging SpikeDual Bolt Pattern Header Flange Kooks ULTRA GREEN Cats EPA verified 400 Cell High Flow Catalytic ConvertersKooks ULTRA GREEN Cats are engineered to perform in Modern Muscle cars making up to 850 RWHPIncludes Gaskets, Oxygen Sensor Extension Harness, Clamps, Bolt Kit, and O2 Spacers for Installation. No additional parts required.
Manufacturer notes
2015-2026 Mustang GT/Dark Horse 5.0L 4V 1-7/8in. x 3in. Stainless Headers w/ULTRA GREEN Catted Connection Pipes and OEM Adapters. 304 Stainless Steel Construction. 3/8in. Thick Laser Cut Flanges. 1-7/8in. Mandrel Bent Primaries. 3in. Collectors with Kooks Patented Scavenging Spike. Dual Bolt Pattern Header Flange. Kooks ULTRA GREEN Cats EPA verified 400 Cell High Flow Catalytic Converters. Kooks ULTRAGREEN Cats are engineered to perform in Modern Muscle cars making up to 850 RWHP. Includes Gaskets; Oxygen Sensor Extension Harness; Clamps; Bolt Kit and O2 Spacers for Installation. No additional parts required.
2015-2026 Mustang GT/Dark Horse 5.0L 4V 1-7/8" x 3" Stainless Headers w/ ULTRA GREEN Catted Connection Pipes and OEM Adapters. 304 Stainless Steel Construction. 3/8" Thick Laser Cut Flanges. 1-7/8" Mandrel Bent Primaries. 3" Collectors with Kooks' Patented Scavenging Spike. Dual Bolt Pattern Header Flange. Kooks ULTRA GREEN Cats EPA verified 400 Cell High Flow Catalytic Converters. Kooks ULTRAGREEN Cats are engineered to perform in Modern Muscle cars making up to 850 RWHP. Includes Gaskets, Oxygen Sensor Extension Harness, Clamps, Bolt Kit and O2 Spacers for Installation. No additional parts required.
Supplier category
Exhaust, Mufflers & Tips
Supplier subcategory
Headers & Manifolds
UPC / barcode
842422182458
Units per product
1
Supplier Proposition 65 status
Y
Supplier EPA status
Compliant
Air freight prohibited
No
Not CARB approved
Yes
CARB acknowledgement required
Yes
Freight delivery required
No
Powersports product
No
More manufacturer information
Other product descriptions
Kooks 15-26 Mustang GT/DH 5.0L 4V 1-7/8 x3 SS Headers w/Ultra Green Catted Conn Pipe/w OEM Adapters
1-7/8in. Hdr w/ULTRA GREEN OEM Connectio
1-7/8" Hdr w/ULTRA GREEN OEM Connection
1-7/8in. Hdr w/Conns
1-7/8" Hdr w/Conns.
About the manufacturer
Kooks Headers and Exhaust has been the leader in the High Performance Exhaust Industry for over 50 Years! Since 1962, Kooks takes pride in offering the best Headers and complete exhaust systems for your street, race and off-road applications. We have won hundreds of championships and set countless records in the NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA and many other racing organizations. Now with three generations of family leadership, we are proud to say that all of our products are handcrafted here in the USA and we are proud to still be independently owned and operated. And don't forget, "Get Kookin with KOOKS!"
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Enter Garage ↗Kooks 15-26 Mustang GT/DH 5.0L 4V 1-7/8 x3 SS Headers w/Ultra Green Catted Conn Pipe/w OEM Adapters | Q40 Motorsports
