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.
Bring your LS-powered Jeep exhaust together
An LS conversion changes what your Jeep can be. This Kooks Y-pipe joins the matching LS-swap headers to the 37104100 cat-back, giving your 2007-2018 JK 4-door a purpose-made 3-inch exhaust connection.
SKU: 37103100
Made around the LS conversion
37103100 uses 16-gauge, mandrel-bent 304 stainless steel with TORCA header connections. It matches Kooks 37102200 or 37102400 headers and the 37104100 rear exhaust, so you can buy the front and rear sections that belong together.
Give the driveline enough room
Use an RPM Extreme or comparable LS conversion kit. A minimum 2-1/2-inch lift is recommended. Your installer should align the engine, driveline and exhaust together, with room around the starter, front driveshaft and wiring.
Matching products
For a 2007-2018 JK 4-door using the specified LS conversion kit and engine mounts, the 1-3/4-inch LS-swap headers provide the matching front header connection. This header route requires an RPM Extreme JKLS-HC-ENG-MOUNT plate or equivalent and GM Gen IV hydraulic engine mounts; a minimum 2-1/2-inch suspension lift is recommended. Finish that same JK 4-door LS conversion with the LS-swap cat-back; the headers, Y-pipe and rear section are separate purchases.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2018 | Jeep Wrangler JK Unlimited Sahara | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Sport S | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Rubicon | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Willys Wheeler | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2018 | Jeep Wrangler JK Unlimited Sport | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2007-2017 | Jeep Wrangler Unlimited Rubicon | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2007-2017 | Jeep Wrangler Unlimited Sahara | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2007-2010 | Jeep Wrangler Unlimited X | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2010-2017 | Jeep Wrangler Unlimited Sport | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2010 | Jeep Wrangler Unlimited Mountain | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2016 | Jeep Wrangler Unlimited Sport S | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2016 | Jeep Wrangler Unlimited 75th Anniversary | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2017 | Jeep Wrangler Unlimited Winter Edition | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
| 2017 | Jeep Wrangler Unlimited Smoky Mountain | Installed LS | 37103100 | LS conversion; RPM Extreme or comparable kit; 37102200 / 37102400 headers and 37104100 cat-back; minimum 2-1/2-inch lift recommended |
Intended use
37103100: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 37103100.
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 | 37103100 |
| Application | 2007-2018 Jeep Wrangler JK 4-door with LS conversion |
| Pipe diameter | 3-inch |
| Construction | 16-gauge, mandrel-bent tubing |
| Header connection | TORCA |
| Required headers | 37102200 or 37102400 |
| Required rear exhaust | 37104100 cat-back |
| Engine conversion | RPM Extreme or comparable LS conversion kit |
| Recommended lift | Minimum 2-1/2-inch lift |
| Catalysts | Uncatted Competition version |
| Material | 304 stainless steel |
Frequently asked questions
Which headers and rear exhaust does it need?
Use 37102200 or 37102400 Kooks LS-swap headers and the 37104100 cat-back. These parts are purchased separately.
Does it include catalytic converters?
No. 37103100 is the uncatted Competition Y-pipe.
