Know the landed cost before you order
Prices include VAT. Shipping is charged separately and calculated at checkout for your destination. If no shipping option is shown, contact us for a quote before ordering.
Complete the exhaust for your LS-powered Wrangler
Bring your four-door JK LS swap together with a Kooks 3" GREEN-catted Y-pipe. It is designed to join Kooks 37102200 or 37102400 swap headers to the 37104100 cat-back, with TORCA Swivel-Seal inlet joints and mandrel-bent stainless tubing.
SKU: 37103300
A matched exhaust for the conversion
The 16-gauge 304 stainless Y-pipe is designed around an RPM Extreme or similar LS swap kit. Pair it with the 37102200 1-3/4-inch swap headers or 37102400 1-7/8-inch swap headers. Both header choices require an RPM Extreme JKLS-HC-ENG-MOUNT engine-mount plate or equivalent, together with GM Gen 4-style hydraulic engine mounts. Complete the system with the 37104100 LS-swap cat-back. These are the specified front and rear components for the conversion.
Plan the clearance around your swap
A minimum 2-1/2" suspension lift is recommended. Engine-swap installations can need additional fitting parts or work depending on the conversion, so discuss your engine, swap kit and suspension with us before ordering. The listed application is the four-door JK.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2018 | Jeep Wrangler JK Unlimited Rubicon | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Sahara | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Willys Wheeler | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Sport | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Sport S | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2007-2017 | Jeep Wrangler Unlimited Rubicon | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2007-2017 | Jeep Wrangler Unlimited Sahara | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2007-2010 | Jeep Wrangler Unlimited X | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2010-2017 | Jeep Wrangler Unlimited Sport | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2010 | Jeep Wrangler Unlimited Mountain | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2016 | Jeep Wrangler Unlimited 75th Anniversary | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2016 | Jeep Wrangler Unlimited Sport S | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2017 | Jeep Wrangler Unlimited Winter Edition | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension lift recommended |
| 2017 | Jeep Wrangler Unlimited Smoky Mountain | LS engine conversion | 37103300 | 4-door JK with LS engine swap; specified Kooks headers and cat-back; 2-1/2" suspension 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 | 37103300 |
| Application | 2007-2018 Wrangler JK 4-door with LS engine swap |
| Material | 3" mandrel-bent, 16-gauge 304 stainless steel |
| Catalysts | GREEN, 300-cell high-flow specification for 37103300 |
| Front joint | TORCA Swivel-Seal |
| Required headers | Kooks 37102200 or 37102400; separate purchase |
| Required rear system | Kooks 37104100 cat-back; separate purchase |
| Swap kit | Designed around RPM Extreme or similar LS swap kit |
| Suspension | Minimum 2-1/2" suspension lift recommended |
| Installation | Additional parts or fitting work may be needed for the individual swap |
| Header engine mounts | RPM Extreme JKLS-HC-ENG-MOUNT plate or equivalent; GM Gen 4-style hydraulic mounts |
Frequently asked questions
Is this for the standard Wrangler engine?
It is for a four-door JK with an LS engine swap and the specified matching Kooks exhaust parts.
Is a body lift the recommendation?
The stated recommendation is a minimum 2-1/2" suspension lift.
Which headers and cat-back should I use?
Use Kooks 37102200 or 37102400 headers and the 37104100 cat-back. Talk to us about your LS conversion if you want help matching the exhaust to your swap kit.
