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The Stainless Works M24H3CATLG is a set of long-tube headers with high-flow catalytic converters built for the 2015-2026 Ford Mustang GT with the 5.0L Coyote V8. Using 1-7/8-inch 304 stainless steel primary tubes and a 3-inch collector with integrated merge spike, the M24H3CATLG is engineered for enthusiasts running a non-Stainless-Works aftermarket cat-back exhaust who want the performance and sound of a proper long-tube header without replacing their existing system. The aftermarket connect 3-inch outlet fits most aftermarket cat-back brands including MBRP, Corsa, Borla, and similar. Handmade to order in Streetsboro, Ohio and backed by a lifetime warranty.
What's Included
- Driver-side long-tube header
- Passenger-side long-tube header
- 2 high-flow catalytic converters
- 2 lead pipes
- 4 band clamps
- 4 O2 sensor extensions
- 16-piece bolt kit
- RTV sealant
Aftermarket Connect: Designed for Your Existing Cat-Back
The M24H3CATLG uses a 3-inch aftermarket connect outlet engineered to fit most popular aftermarket cat-back exhaust systems that use a 3-inch inlet connection. If you already own an MBRP, Corsa, Borla, or similar brand cat-back, this is the header variant that connects directly to your existing system without requiring a full exhaust replacement. Some fitments may require minor trimming for precise alignment. If you are retaining the OEM Ford factory cat-back, see the M24HCAT (factory connect) instead.
1-7/8-Inch Primaries: Optimized for Street and Track NA Builds
The 1-7/8-inch primary tubes on the M24H3CATLG are the most popular choice for naturally aspirated and mildly modified 5.0L Coyote builds. Smaller primaries maintain higher exhaust velocity at low and mid RPM, improving throttle response and mid-range torque delivery. For forced induction builds where peak flow at high RPM and under boost is the priority, the 2-inch M242H3CATLG is the correct choice.
Fitment for 2015-2026 Ford Mustang GT
The M24H3CATLG fits the 2015-2026 Ford Mustang GT with the 5.0L Coyote V8 only. Not compatible with the EcoBoost 2.3L or the Shelby GT500. An ECU retune is strongly recommended after installation.
| Year | Make | Model | Trim | Engine |
|---|---|---|---|---|
| 2015 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2016 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2017 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2018 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2019 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2020 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2021 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2022 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2023 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2024 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2025 | Ford | Mustang | GT | 5.0L Coyote V8 |
| 2026 | Ford | Mustang | GT | 5.0L Coyote V8 |
Full Specifications
| Specification | Detail |
|---|---|
| Part Number | M24H3CATLG |
| UPC | 887753444004 |
| Header Type | Long-Tube Headers with High-Flow Catalytic Converters |
| Primary Tube Diameter | 1-7/8 in. |
| Collector Diameter | 3 in. with Integrated Merge Spike |
| Flange Thickness | 3/8 in. |
| Material | 304 Stainless Steel, CNC Mandrel-Bent, TIG Welded |
| Connection Point | Aftermarket Connect, 3 in. outlet (fits most aftermarket cat-backs) |
| Catalytic Converters | High-Flow, 2 included |
| O2 Sensor Extensions | 4 included |
| Installation Type | Bolt-On (minor trimming may be required on some aftermarket cat-backs) |
| ECU Tune Recommended | Yes, strongly recommended after installation |
| Country of Origin | Made in USA (Streetsboro, Ohio) |
| Warranty | Lifetime Warranty |
| Build Time | Built to order, approximately 4 weeks |
Not Street Legal in California
The M24H3CATLG does not carry a CARB Executive Order number and is not legal for street use in California or other CARB-adopting states. It is intended for track use or street use in non-CARB states.
Warranty and Factory Coverage
Stainless Works backs the M24H3CATLG with a lifetime warranty on materials and workmanship. Under the federal Magnuson-Moss Warranty Act, an aftermarket part cannot void your factory warranty unless the dealer proves the part directly caused the specific failure claimed.
Compare: Full Stainless Works S550 and S650 Mustang GT Header Family
| Part Number | Primary Tube | Connection Point | Best For |
|---|---|---|---|
| M24HCAT | 1-7/8 in. | Factory Connect (2-1/4 in.) | Street NA builds retaining OEM cat-back |
| M24H3CAT | 1-7/8 in. | Performance Connect (3 in.) | Stainless Works cat-back pairing |
| M24H3CATLG | 1-7/8 in. | Aftermarket Connect (3 in.) | Non-SW aftermarket cat-back (MBRP, Corsa, etc.) |
| M242HCAT | 2 in. | Factory Connect (2-1/4 in.) | Forced induction or max-flow NA, OEM cat-back retained |
| M242H3CAT | 2 in. | Performance Connect (3 in.) | Forced induction with Stainless Works cat-back |
| M242H3CATLG | 2 in. | Aftermarket Connect (3 in.) | Forced induction with non-SW aftermarket cat-back |
About Stainless Works
Stainless Works has been handcrafting performance exhaust systems in Streetsboro, Ohio since 1989. Every header set is built to order from 304 stainless steel using CNC mandrel bending and full TIG welding, and backed by a lifetime warranty.
Frequently Asked Questions
What aftermarket cat-back brands does the M24H3CATLG connect to?
The M24H3CATLG aftermarket connect outlet is sized at 3 inches and is compatible with most major aftermarket cat-back systems including MBRP, Corsa, Borla, Magnaflow, and similar brands that use a 3-inch inlet connection. Some fitments may require minor trimming for a precise fit. If you are keeping the OEM Ford factory cat-back, order the M24HCAT (factory connect) instead.
What is the difference between the M24H3CATLG and the M24HCAT?
Both use 1-7/8-inch primary tubes. The M24H3CATLG has a 3-inch aftermarket connect outlet designed for non-Stainless-Works aftermarket cat-backs. The M24HCAT has a 2-1/4-inch factory connect outlet that bolts directly to the OEM Ford cat-back without any modification.
Does the M24H3CATLG fit the 2024 and newer S650 Mustang GT?
Yes. Stainless Works lists this header through 2026 and includes separate installation instructions for the S650 platform.
Is a tune required after installing the M24H3CATLG?
Yes, strongly recommended. Long-tube headers change exhaust scavenging and O2 sensor readings. A proper ECU retune maximizes power gains and prevents check engine lights from the repositioned catalysts.
Will the M24H3CATLG void my Ford factory warranty?
Under the federal Magnuson-Moss Warranty Act, a dealer cannot void your factory warranty simply because you installed aftermarket headers. They must prove the part directly caused the specific failure claimed.
Is the M24H3CATLG legal in California?
No. It does not hold a CARB Executive Order number and is not street legal in California or other CARB-adopting states.
How long does it take to receive the M24H3CATLG?
Each set is built to order in Stainless Works' Ohio facility with a current lead time of approximately four weeks.
What is the difference between M24H3CATLG and M24H3CAT?
The M24H3CATLG is the aftermarket connect variant designed for non-Stainless-Works cat-backs. The M24H3CAT is the performance connect variant designed specifically to pair with Stainless Works brand cat-back systems. Both use 1-7/8-inch primaries and a 3-inch collector.
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