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Give your LS-powered Jeep its rear exhaust
Complete the exhaust on your LS-converted JK with a rear system made for the conversion. Kooks 37104100 uses 3-inch, 16-gauge mandrel-bent 304 stainless tubing and an oval muffler for the 2007-2018 Wrangler JK 4-door.
SKU: 37104100
A matching rear section for the conversion
The 3-inch oval muffler has a 4 x 9 x 14-inch body. Pair the cat-back with the Kooks LS-swap headers and Y-pipe, so the front, middle and rear of the exhaust belong to the same installation.
Make room for the LS installation
Use an RPM Extreme or comparable conversion kit, with a minimum 2-1/2-inch lift recommended. Have the installer check driveline and chassis clearance as the full system is aligned.
Matching products
The LS-swap Competition Y-pipe joins this cat-back to the Kooks LS-swap headers on the 2007-2018 JK 4-door using the specified conversion kit and recommended lift.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2018 | Jeep Wrangler JK Unlimited Sport | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Sport S | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Sahara | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Rubicon | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Willys Wheeler | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2007-2017 | Jeep Wrangler Unlimited Sahara | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2007-2017 | Jeep Wrangler Unlimited Rubicon | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2007-2010 | Jeep Wrangler Unlimited X | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2010-2017 | Jeep Wrangler Unlimited Sport | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2010 | Jeep Wrangler Unlimited Mountain | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2016 | Jeep Wrangler Unlimited Sport S | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2016 | Jeep Wrangler Unlimited 75th Anniversary | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2017 | Jeep Wrangler Unlimited Winter Edition | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
| 2017 | Jeep Wrangler Unlimited Smoky Mountain | Installed LS | 37104100 | LS conversion; specified conversion kit; matching Kooks headers / Y-pipe; minimum 2-1/2-inch lift recommended |
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 |
|---|---|
| SKU | 37104100 |
| Application | 2007-2018 Jeep Wrangler JK 4-door with LS conversion |
| Pipe diameter | 3-inch |
| Construction | 16-gauge, mandrel-bent tubing |
| Muffler | 3-inch oval muffler; 4 x 9 x 14-inch body |
| Required front parts | Kooks LS-swap headers and Y-pipe |
| Engine conversion | RPM Extreme or comparable LS conversion kit |
| Recommended lift | Minimum 2-1/2-inch lift |
| Material | 304 stainless steel |
Frequently asked questions
Will this fit behind the standard Jeep engine exhaust?
It is for the specified LS conversion, with Kooks LS-swap headers and Y-pipe.
Is this for the two-door JK?
The offered application is the 2007-2018 JK 4-door. The conversion and recommended lift conditions apply.
