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Maximum Flow, Full Emissions Compliance: Long Tube Power Without the Compromise
The Kooks 1156H640 2-inch x 3-inch long tube headers and H.O. GREEN catted connection pipes kit unleashes the full potential of the 2020 and 2022 Mustang Shelby GT500 with the supercharged 5.2L Predator V8, replacing factory manifolds to deliver dyno-proven gains of 70 and 90 rear-wheel horsepower and 80 and 110 lb-ft of torque through equal-length primaries, merged collectors, and high-flow 3-inch H.O. GREEN catted pipes that bolt directly to the OEM mid-pipe for seamless integration and unrestricted flow under boost pressures exceeding 15 PSI.
Handcrafted from T304 aircraft-quality stainless steel with 3/8-inch laser-cut flanges, full TIG welds, and 400-cell metallic substrate H.O. GREEN catalytic converters, this system supports over 1,100 HP while remaining 49-state emissions compliant and preserving the GT500’s ferocious supercharged soundtrack without drone. The precision design maintains factory ground clearance and heat shielding for daily-driven supercars.
For Shelby GT500 owners who demand championship-level performance with street-legal reliability, the 1156H640 kit is the race-winning, complete bolt-on solution trusted by the fastest GT500s on road and track.
Key Features
- 2-inch equal-length mandrel-bent primaries for maximum scavenging
- 3-inch H.O. GREEN high-flow metallic catalytic converters
- Full T304 stainless steel with TIG welds and 3/8-inch flanges
- Merged collectors for optimal exhaust velocity
- Direct bolt-on to OEM mid-pipe no cutting required
- Dyno gains of 70 and 90 RWHP and 80 and 110 RWTQ
Product Notes
- 49-state EPA compliant not for sale or use in California or CARB states without exemption
- Fits 2020 and 2022 Mustang Shelby GT500 coupe only
- Includes O2 extensions and all necessary hardware
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 required lift and exhaust experience needed
- Remove factory manifolds and bolt headers to cylinder heads
- Connect catted pipes to collectors and OEM mid-pipe
- Torque flanges to 25-30 ft-lbs and run drive cycle for ECU adaptation
This Part Fits
| Year | Make | Model | Submodel/Engine |
|---|---|---|---|
| 2020 and 2022 | Ford | Mustang | Shelby GT500 5.2L Predator Supercharged V8 |
Note: Fits all 2020 and 2022 Shelby GT500 coupe with factory exhaust. Manual transmission only.
What's Included in the Purchase
- (2) 2" x 3" Long-Tube T304 Stainless Headers with Merged Collectors
- (2) 3" H.O. GREEN Catted Connection Pipes
- Gaskets, Stage 8 Locking Bolts, Clamps and Hardware
- O2 Sensor Extensions
- Detailed Installation Instructions
- Part Number: Kooks 1156H640
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 fit the 2020 GT500?
A: Yes, direct bolt-on for all 2020 and 2022 Shelby GT500 -
Q: Will it cause a check engine light?
A: No, H.O. GREEN cats and extensions maintain proper O2 function -
Q: How loud is it?
A: Insane supercharged roar at WOT, refined without drone at cruise -
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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