Know the landed cost before you order
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Choose an X-crossover and keep your Mustang rear exhaust
Join your Kooks header-and-connection exhaust to the OEM rear system with the ULTRA X-pipe. 11513700 supplies a 3-inch mandrel-bent 304 stainless crossover, with the adapters and clamps included for the listed 5.0 Mustang installation.
SKU: 11513700
The rear connection parts are included
The supplied mid-pipe adapters and all clamps let you connect the Kooks front exhaust to the OEM rear section. You can choose this complete crossover arrangement instead of buying separate OEM adapters for those joints.
Choose the crossover you prefer
The ULTRA X-pipe joins the two exhaust banks through an X-crossover. If you prefer an H-crossover, compare the matching Competition H-pipe for the same header-and-connection installation; your retained rear mufflers still influence the sound.
Matching products
For the same 2015-2026 GT 5.0 Kooks-header-and-connection installation, compare the Competition H-pipe if you prefer an H-crossover; it also includes mid-pipe adapters and clamps.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2015-2026 | Ford Mustang GT | 5.0L V8 | 11513700 | GT / Dark Horse 5.0L; Kooks headers and connection pipes; OEM rear; adapters / clamps included |
| 2015-2026 | Ford Mustang GT Premium | 5.0L V8 | 11513700 | GT / Dark Horse 5.0L; Kooks headers and connection pipes; OEM rear; adapters / clamps included |
| 2019-2020 | Ford Mustang Bullitt | 5.0L V8 | 11513700 | GT / Dark Horse 5.0L; Kooks headers and connection pipes; OEM rear; adapters / clamps included |
| 2021-2023 | Ford Mustang Mach 1 | 5.0L V8 | 11513700 | GT / Dark Horse 5.0L; Kooks headers and connection pipes; OEM rear; adapters / clamps included |
| 2024-2026 | Ford Mustang Dark Horse | 5.0L V8 | 11513700 | GT / Dark Horse 5.0L; Kooks headers and connection pipes; OEM rear; adapters / clamps included |
| 2024-2025 | Ford Mustang Dark Horse Premium | 5.0L V8 | 11513700 | GT / Dark Horse 5.0L; Kooks headers and connection pipes; OEM rear; adapters / clamps included |
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 | 11513700 |
| Application | 2015-2026 Mustang GT / Dark Horse 5.0L |
| Pipe diameter | 3-inch |
| Construction | Mandrel-bent tubing |
| Included | Mid-pipe adapters and all clamps |
| Required front parts | Kooks long tube headers and connection pipes |
| Rear connection | OEM rear exhaust |
| Crossover style | ULTRA X-pipe |
| Material | 304 stainless steel |
Frequently asked questions
Can I fit this behind the factory headers?
11513700 requires Kooks long tube headers and connection pipes. The OEM connection is at the rear.
Do I need to buy separate mid-pipe adapters?
The mid-pipe adapters and all clamps are included with this X-pipe.
