Stainless Power SM12HCATX Long Tube Headers w/X-Pipe for 11-14 Mustang GT 5.0L

Vehicle Fitment

• 2011-2014 Ford Mustang GT, 5.0L Coyote V8

Fitment Notes

• Performance Connect configuration -- mates to Stainless Works catback exhaust
• Replaces factory manifolds, catalytic converters, and H-Pipe as a complete system
• Not CARB legal / not California legal
• Approx. full-day professional installation

Features

• 1-7/8" primary tubes
• Includes 3" X-Pipe
• 3" diameter lead pipes with high-flow catalytic converters
• TIG-welded 304 stainless steel construction
• 3/8" thick flanges, won't warp
• 3" slip-fit collectors with merge spikes
• Lifetime guaranteed bolt-on system

Specifications

• Primary tube diameter: 1-7/8"
• Collector/lead pipe diameter: 3"
• X-Pipe diameter: 3"
• Flange thickness: 3/8"
• Material: 304 stainless steel, mill finish
• Catalytic converter: Included, high-flow, 2x

Included Components

• 2x Catted Long Tube Headers
• 1x 3" X-Pipe

Product Description

Stainless Power's 1-7/8" Long Tube Headers with Catted X-Pipe give the 2011-2014 Mustang GT a complete, high-flow replacement for the factory manifolds, catalytic converters, and H-Pipe in one system. Built from TIG-welded 304 stainless steel with 3/8" thick flanges that resist warping under heat cycling, this kit pairs the headers with a matched 3" X-Pipe for improved exhaust scavenging and a smoother, more balanced tone across the RPM range.

3" diameter lead pipes with high-flow catalytic converters and integrated merge spikes carry exhaust from the 3" slip-fit collectors into the X-Pipe, delivering meaningful gains in horsepower and torque throughout the powerband. This Performance Connect version is designed to mate directly to a Stainless Works catback exhaust system for a complete, purpose-matched 3" setup.

Backed by a lifetime guarantee on material and workmanship. Note: this system is not CARB legal and cannot be sold or shipped for use in California. Installation is a full-day job best handled by an experienced installer or exhaust shop.