Kooks 11-14 Ford Mustang GT 5.0L 4V 3in x 2 3/4in OEM Cat X Pipe Kooks HDR Req

Kooks 3" GREEN Catted X-Pipe for 2011 and 2014 Ford Mustang GT 5.0L Coyote

The Kooks 11413200 3-inch GREEN catted X-pipe completes the exhaust upgrade on 2011 and 2014 Ford Mustang GT models with the 5.0L Coyote V8, linking Kooks long tube headers directly to the factory mid-pipe for seamless integration that maintains 49-state emissions compliance while adding 20 and 30 rear-wheel horsepower and 25 and 35 lb-ft of torque through high-flow 300-cell metallic substrate GREEN catalytic converters and mandrel-bent crossover design for balanced exhaust flow.

Handcrafted from T304 aircraft-quality stainless steel with 3/8-inch laser-cut flanges and full TIG welds, this X-pipe ensures zero leaks under extreme heat and supports over 800 HP from tunes or cams without sacrificing ground clearance or daily drivability. The crossover configuration equalizes cylinder pulses for smoother power delivery and a deeper, more aggressive V8 note at wide-open throttle with zero drone at cruise.

For Mustang GT owners pairing Kooks headers with stock exhaust, the 11413200 GREEN catted X-pipe is the essential emissions-legal link that maximizes Coyote performance with proven reliability.

Key Features

• 3-inch mandrel-bent T304 stainless steel X-pipe
• GREEN 300-cell high-flow metallic catalytic converters
• Direct bolt-on to Kooks headers and OEM mid-pipe
• 3/8-inch laser-cut flanges with full TIG welds
• Supports 800+ HP with proper tuning
• Balances exhaust for smoother power and sound

Product Notes

• 49-state EPA compliant not for sale or use in California or CARB states without exemption
• Requires Kooks long tube headers for proper fitment
• Includes all hardware and gaskets

California Proposition 65: Contains chemicals known to the State of California to cause cancer or reproductive harm.

Warranty: Limited lifetime on stainless construction and 25,000 miles on catalytic converters to original purchaser.

Installation Notes

• Professional installation recommended lift required
• Bolt X-pipe to Kooks header collectors with supplied gaskets
• Connect to OEM mid-pipe using included hardware
• Torque flanges to 25-30 ft-lbs and check for leaks after heat cycle

This Part Fits

Note: Fits all 2011 and 2014 Mustang GT coupe and convertible with Kooks long tube headers. Manual or automatic.

What's Included in the Purchase

• (1) 3" GREEN Catted X-Pipe
• Gaskets and Flange Hardware Kit
• Detailed Installation Instructions
• Part Number: Kooks 11413200

Why Choose Kooks?

• Over 60 years of championship-winning exhaust engineering
• Handcrafted in the USA from T304 aircraft-quality stainless steel
• Limited lifetime warranty and dyno-proven performance

Frequently Asked Questions

• Q: Does this work with factory headers?
  A: No, designed specifically for Kooks long tube headers
• Q: Is it emissions legal?
  A: Yes, 49-state EPA compliant with GREEN cats
• Q: How much power does it add?
  A: 20 and 30 RWHP when paired with Kooks headers
• Do Kooks headers require a tune after installation?
  Yes. A professional tune is strongly recommended after installing long tube headers. The significant improvement in exhaust flow changes air fuel ratios and requires ECM recalibration to achieve optimal power output and safe operation.
• Will these headers void my factory powertrain warranty?
  Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle warranty simply because you installed an aftermarket part unless they prove the component directly caused the failure. Consult your dealer for specifics on your situation.
• Q: Do these Kooks headers require a tune after installation?
  A: Yes. A professional tune is strongly recommended after installing long tube headers. The significant improvement in exhaust flow changes air fuel ratios and requires ECM recalibration to achieve optimal power output and safe operation.
• Q: Will Kooks headers void my factory powertrain warranty?
  A: Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle warranty simply because you installed an aftermarket part unless they prove the component directly caused the failure in question. Consult your dealer for specifics.
• Q: What warranty does Kooks provide?
  A: Kooks products are backed by a limited lifetime warranty to the original purchaser against defects in materials and workmanship. Racing and competition use applications may have specific warranty exclusions. Contact Kooks Performance directly for warranty details.

Shipping & Handling

• Method: UPS or Fed Ex Ground.
• Availability: Typically ships same day or next if in stock.
• Packaging: Heavy-duty box with foam protection.