Know the landed cost before you order
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Enjoy more of your HEMI without replacing the rear exhaust
Upgrade the front exhaust on your 5.7 HEMI with Kooks long tube headers and a matching connection kit. Choose Performance or GREEN cats, with 1-7/8" primary tubing and an OEM rear exhaust connection. The packages cover the listed WK2 Grand Cherokee and Durango applications.
SKUs: 3610H421, 3610H431
A matched front upgrade
Both kits combine 1-7/8" headers, 3" collectors and the stainless front pipes needed to join the OEM rear system. It is a useful route if you want to improve the exhaust from the engine back while keeping the rear system already fitted.
Use the right years for your vehicle
The WK2 Grand Cherokee range ends at 2021, while the listed Durango applications extend through their separate trim ranges up to 2026. Performance cats are for naturally aspirated use. GREEN is the choice here for a forced-induction 5.7 build.
Choose your configuration
| SKU | Configuration | Supplied arrangement | Fitting / engine conditions |
|---|---|---|---|
| 3610H421 | Cat Type: Performance Cats | Headers; Performance Cats front connections | Naturally aspirated only |
| 3610H431 | Cat Type: GREEN Cats | Headers; GREEN Cats front connections | Use the SKU-specific vehicle rows below |
Tuning for your exhaust upgrade
We recommend tuning with every header installation so the calibration suits your new headers, complete exhaust and fuel. Contact us to discuss the right tuning route for your vehicle.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2011-2026 | Dodge Durango R/T | 5.7L V8 | 3610H421, 3610H431 | |
| 2011-2024 | Dodge Durango Citadel | 5.7L V8 | 3610H421, 3610H431 | |
| 2011-2013 | Dodge Durango Crew | 5.7L V8 | 3610H421, 3610H431 | |
| 2014-2016 | Dodge Durango Limited | 5.7L V8 | 3610H421, 3610H431 | |
| 2011-2021 | Jeep Grand Cherokee Overland | 5.7L V8 | 3610H421, 3610H431 | |
| 2011-2021 | Jeep Grand Cherokee Limited | 5.7L V8 | 3610H421, 3610H431 | |
| 2011-2013 | Jeep Grand Cherokee Laredo | 5.7L V8 | 3610H421, 3610H431 | |
| 2012 | Jeep Grand Cherokee Overland Summit | 5.7L V8 | 3610H421, 3610H431 | |
| 2014-2021 | Jeep Grand Cherokee Summit | 5.7L V8 | 3610H421, 3610H431 | |
| 2017-2021 | Jeep Grand Cherokee Trailhawk | 5.7L V8 | 3610H421, 3610H431 | |
| 2018-2021 | Jeep Grand Cherokee High Altitude | 5.7L V8 | 3610H421, 3610H431 |
Intended use
3610H421: Competition, off-road and track use only. Not for use on public roads.
Ordering and delivery
Estimated lead time is 4-6 weeks. Delivery may be faster depending on stock levels. Shipping is charged separately.
Technical specifications
| Specification | Details |
|---|---|
| SKUs | 3610H421, 3610H431 |
| Applications | 2011-2021 WK2 Grand Cherokee; listed 2011-2026 Durango trims |
| Engine | 5.7L HEMI V8 |
| Material | 304 stainless steel |
| Headers | 1-7/8" primaries; 3" collectors |
| Front pipes | Performance or GREEN catted; OEM rear connection |
| Performance catalyst condition | Naturally aspirated only |
Frequently asked questions
Does the newer Grand Cherokee WL fit?
This kit uses the WK2 Grand Cherokee application. Match the generation as well as the 5.7 engine.
Are these for the 6.4 SRT?
This page is the 5.7 HEMI kit. The 6.4 SRT uses a separate application.
