Stainless Power 2011-14 Mustang GT Headers 1-7/8in Primaries High-Flow Cats 3in X-Pipe (part # SM11HCATX), built from 304 stainless steel by Stainless Works in Streetsboro, Ohio.
304 Stainless Steel
TIG Welded
2011–2014 Mustang GT 5.0L
Lifetime Warranty
Overview
This 2011–2014 Mustang GT header system is designed to maximize the horsepower on that 5.0L motor. Don't settle when it comes to your Mustang — get the best header system on the market.
Our products have a reputation for unmatched quality and performance. Get a set ordered today so you can gap your buddies on the track.
Why Stainless Works
- American-made from raw material to finished product
- TIG welded by skilled craftsmen for strength and beauty
- Lifetime warranty on material and craftsmanship
- Direct bolt-on fit for 2011–2014 Mustang GT 5.0L
- Multiple connection options to match your build
Key Features
1-7/8" or 2" Primary Tubes
Choose the primary size that best matches your Mustang GT build.
3" Collector
Integrated merge spike supports improved exhaust flow and performance.
Factory Connection
Fits to stock exhaust with a 2-1/4" connection.
Performance Connection
Fits Stainless Works catback systems with a 3" connection.
Aftermarket Connection
Fits most aftermarket catbacks with a 3" connection. May require cutting.
Bolt-On Power
Adds horsepower and torque with a true performance header upgrade.
Mandrel Bent Tubing
Smooth airflow with zero restriction bends.
TIG Welded Construction
Precision welds for maximum durability.
What's In The Box
- Driver Side Header
- Passenger Side Header
- Catalytic Converters x2
- Lead Pipes x2
- Clamps x6
- O2 Extension x1
- Bolt Kit — 32 Pieces
- RTV Tube x1
- Installation Instructions
Specifications
| Vehicle Fitment |
2011–2014 Mustang GT 5.0L |
| Primary Tube Options |
1-7/8" or 2" |
| Collector |
3" with Integrated Merge Spike |
| Material |
304 Stainless Steel |
| Welding |
Fully TIG Welded |
| Catalytic Converters |
High-Flow Included |
| Connection Options |
Factory (2-1/4"), Performance (3"), Aftermarket (3") |
| Warranty |
Lifetime on Material and Craftsmanship |
| Origin |
Made in USA — Streetsboro, Ohio |
⇩ Download Installation Instructions (PDF)
See It In Action
Full install and sound demo — Long tube headers on a 2011–2014 Mustang GT 5.0L
Frequently Asked Questions
Will these headers fit my 2011-2014 Mustang GT?
Yes. This kit is designed specifically for the 2011–2014 Mustang GT 5.0L and is a direct bolt-on upgrade.
Which primary tube size should I choose?
Both 1-7/8" and 2" primary tubes are available. The right choice depends on your specific build goals and supporting modifications — call our team if you need guidance.
Do these come with catalytic converters?
Yes. High-flow catalytic converters are included with this kit.
What's included in the box?
Each kit includes driver and passenger side headers, 2 catalytic converters, 2 lead pipes, 6 clamps, an O2 extension, a 32-piece bolt kit, RTV tube, and installation instructions.
Customer Reviews
★★★★★
Long Tube Headers 11-14 GT 5.0
Verified Buyer — Gene | January 19, 2024
I have ordered from Stainless Works before for my 2021 RAM 1500 long tube headers and X pipe and they fit perfectly and were fabricated extremely well, which is why I purchased long tube headers and X pipe for my 2013 GT 5.0. They also came fabricated extremely well. I only wish they were associated with Jet-Hot coatings to limit turnaround time for those of us who need to keep engine bay heat down. Overall the quality, customer support, and price are unbeatable. I would highly recommend if you are looking to modify your build with headers and X pipe, this is the place to go.
Questions? Call us at | Mon–Fri 7:30am–4:30pm EST
Free Shipping on Orders $50+
This Listing
- Brand: Stainless Works
- Part number: SM11HCATX
- Product type: Headers
- Fitment: 2011-14 Mustang GT
- Configuration: Stainless Power (Made Overseas & 2-Year Warranty), High-Flow Cats, Stock Exhaust (Factory Connect)
- EPA status: Testing
- Shipping weight: 59.8 lb
California Prop 65 warning applies to this product.
Emissions note: headers, downpipes and catless/high-flow pipes may not be legal for street use in all states. Check your local emissions laws before installing.
Fitment note: Stainless Works systems are application-specific (year, cab/bed, transmission and factory exhaust). Send us your VIN before ordering and we will confirm fitment: 954-507-6261 or sales@americanmuscleperformance.net.
