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Complete the System: Precision Fit Connection Pipes for Full Power Delivery
The Kooks 3-inch GREEN catted dual connection pipes complete the exhaust upgrade on 2015 and 2017 Mustang GT models with the 5.0L Coyote V8, linking Kooks long tube headers directly to the factory mufflers 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 tubing.
Handcrafted from T304 aircraft-quality stainless steel with 3/8-inch laser-cut flanges and full TIG welds, these pipes ensure zero leaks under extreme heat and support over 800 HP from tunes or cams without sacrificing ground clearance or daily drivability. The direct bolt-on design retains factory Active Exhaust valve function and OEM quad tips for a clean appearance with factory-style sound control.
For Mustang GT owners pairing Kooks headers with stock mufflers/tips, the 11513300 GREEN catted connection pipes are the essential emissions-legal link that maximizes Coyote performance while keeping the factory look and valve operation.
Key Features
- 3-inch mandrel-bent T304 stainless steel tubing
- GREEN 300-cell high-flow metallic catalytic converters
- Direct bolt-on to Kooks headers and OEM mufflers
- 3/8-inch laser-cut flanges with full TIG welds
- Supports 800+ HP with proper tuning
- Retains factory Active Exhaust valve function
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
- Fits 2015 and 2017 Mustang GT coupe and convertible
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 pipes to Kooks header collectors with supplied gaskets
- Connect to OEM mufflers using included hardware
- Torque flanges to 25-30 ft-lbs and check for leaks after heat cycle
This Part Fits
| Year | Make | Model | Submodel/Engine |
|---|---|---|---|
| 2015 and 2017 | Ford | Mustang | GT 5.0L Coyote V8 |
Note: Fits all 2015 and 2017 Mustang GT coupe and convertible with Kooks long tube headers and factory mufflers/tips.
What's Included in the Purchase
- (2) 3" GREEN Catted Connection Pipes
- Gaskets and Flange Hardware Kit
- Detailed Installation Instructions
- Part Number: Kooks 11513300
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 keep Active Exhaust valves?
A: Yes, full compatibility with factory valves in mufflers -
Q: Uses factory tips?
A: Yes, retains OEM quad tips -
Q: How much power?
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.
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