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Keep your GT350 rear exhaust with Kooks headers
Join your Kooks header-and-connection exhaust to the OEM GT350 rear system with these 304 stainless adapters. The 3-inch x 2-1/2-inch interface is specific to the stated 2016-2020 GT350 / GT350R 5.2 application.
SKUs: 11513020, 11513020-2
Choose a single replacement or a pair
11513020 is one adapter and two are required per car. 11513020-2 is the pair, so one order provides both adapters. Fitting clamps are purchased separately.
Match the rear exhaust interface
These adapters connect the matching Kooks long tube headers and connection pipes to the OEM GT350 rear exhaust. Some aftermarket Borla or Corsa systems may require trimming; have your installer assess the actual rear system before fitting.
Choose your configuration
| SKU | Configuration | Supplied arrangement | Fitting / engine conditions |
|---|---|---|---|
| 11513020 | Adapter Size: 3" x 2-1/2" (GT350); Quantity: Single | One 3-inch x 2-1/2-inch adapter; two per car; clamps separate | GT350 OEM rear exhaust; Kooks headers / connections; two adapters per car; clamps separate |
| 11513020-2 | Adapter Size: 3" x 2-1/2" (GT350); Quantity: Pair | Pair of 3-inch x 2-1/2-inch adapters; one pair per car; clamps separate | GT350 OEM rear exhaust; Kooks headers / connections; two adapters per car; clamps separate |
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2016-2020 | Ford Mustang Shelby GT350 | 5.2L V8 | 11513020, 11513020-2 | GT350 OEM rear exhaust; Kooks headers / connections; two adapters per car; clamps separate |
| 2016-2020 | Ford Mustang Shelby GT350R | 5.2L V8 | 11513020, 11513020-2 | GT350 OEM rear exhaust; Kooks headers / connections; two adapters per car; clamps separate |
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 | 11513020, 11513020-2 |
| Application | 2016-2020 Shelby GT350 / GT350R 5.2L |
| Adapter diameters | 3-inch x 2-1/2-inch |
| 11513020 quantity | Single adapter; two required per car |
| 11513020-2 quantity | Pair; one pair adapts both pipes |
| Clamps | Purchased separately |
| Required front parts | Kooks long tube headers and connection pipes |
| Rear connection | OEM GT350 exhaust |
| Aftermarket exhaust fitting | Trimming may be required with some Borla / Corsa systems |
| Material | 304 stainless steel |
Frequently asked questions
How many adapters do I need?
Two per car. Choose two single 11513020 adapters or one pair under 11513020-2.
Will these fit the OEM exhaust on a GT 5.0?
These are the GT350 / GT350R OEM-interface adapters. The standard GT 5.0 uses a different adapter product.
