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Maximum Flow, Full Emissions Compliance: Long Tube Power Without the Compromise
The Kooks 3100H420 1-7/8-inch long tube headers and GREEN catted connection kit delivers the complete bolt-on exhaust upgrade for 2005 and 2023 Chrysler 300C, Dodge Charger, Challenger, and Magnum models with the 5.7L HEMI V8, replacing factory manifolds to unlock dyno-proven gains of 45 and 60 rear-wheel horsepower and 40 and 55 lb-ft of torque through equal-length primaries, merged collectors, and high-flow 3-inch GREEN catted pipes that bolt directly to the factory mid-pipe for seamless integration and unrestricted flow from idle to redline.
Handcrafted from T304 aircraft-quality stainless steel with 3/8-inch laser-cut flanges, full TIG welds, and 300-cell metallic substrate GREEN catalytic converters, this system supports over 750 HP while remaining 49-state emissions compliant and preserving the classic muscle car soundtrack with a deeper, more aggressive tone at wide-open throttle and zero drone at cruise. The precision design maintains ground clearance and heat management for daily-driven LX/LC/LD platforms.
For 5.7L HEMI owners who demand championship-level performance with street-legal reliability, the 3100H420 kit is the race-winning, complete bolt-on solution trusted by enthusiasts and racers worldwide.
Key Features
- 1-7/8-inch equal-length mandrel-bent primaries for maximum scavenging
- 3-inch 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 45 and 60 RWHP and 40 and 55 RWTQ
Product Notes
- 49-state EPA compliant not for sale or use in California or CARB states without exemption
- Fits RWD models with 5.7L HEMI VVT
- 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 recommended lift required
- 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 |
|---|---|---|---|
| 2005 and 2010 | Chrysler | 300C | 5.7L HEMI RWD |
| 2006 and 2010 | Dodge | Charger | R/T 5.7L HEMI RWD |
| 2006 and 2008 | Dodge | Magnum | R/T 5.7L HEMI RWD |
| 2009 and 2023 | Dodge | Challenger | R/T, R/T Plus, Scat Pack 5.7L HEMI RWD |
| 2009 and 2023 | Dodge | Charger | R/T, R/T Plus 5.7L HEMI RWD |
Note: Fits RWD models only. Excludes AWD, SRT8, Hellcat, Redeye, Demon.
What's Included in the Purchase
- (2) 1-7/8" x 3" Long-Tube T304 Stainless Headers with Merged Collectors
- (2) 3" GREEN Catted Connection Pipes
- Gaskets, Stage 8 Locking Bolts, Clamps and Hardware
- O2 Sensor Extensions
- Detailed Installation Instructions
- Part Number: Kooks 3100H420
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 AWD models?
A: No, RWD only due to driveline clearance -
Q: Will it cause a check engine light?
A: No, GREEN cats and extensions maintain proper O2 function -
Q: How loud is it?
A: Aggressive V8 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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