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.
Give your Voodoo V8 a stepped Kooks header upgrade
Bring stepped long tube headers to your GT350 or GT350R with Kooks 304 stainless construction and a 3" ball-and-socket collector outlet. The primaries step from 1-3/4" to 1-7/8", with gaskets, bolt kits and two O2 harness extensions included.
SKU: 11542300
Plan the headers and connections together
The one-piece collectors require matching Kooks exhaust connections. The headers do not connect directly to the factory exhaust on their own, so choose the front connection arrangement as part of the purchase.
The fitting parts are included
The round-port headers have 3/8" laser-cut flanges and use the stock bolt pattern. The pack includes 755989 gaskets, BK109 header bolts, BK114 ball-and-socket bolts and two CAS-105979 oxygen-sensor harness extensions.
Tuning for your exhaust upgrade
We recommend tuning with every header installation so the calibration suits your new headers, complete exhaust and fuel. Contact us to discuss the right tuning route for your vehicle.
Matching products
Choose the GT350 GREEN X-pipe connections for a catted front arrangement retaining the factory rear mufflers. The linked range also offers Competition Only pipes. Installation of those connections requires cutting the stock exhaust.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2015-2020 | Ford Mustang Shelby GT350R | 5.2L V8 | 11542300 | |
| 2015-2020 | Ford Mustang Shelby GT350 | 5.2L V8 | 11542300 |
Intended use
Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 11542300.
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 | 11542300 |
| Applications | 2015-2020 Shelby GT350 / GT350R 5.2L V8 |
| Material | 304 stainless steel |
| Primaries | Stepped 1-3/4" to 1-7/8"; mandrel bent |
| Flanges | 3/8" laser-cut; round port; stock bolt pattern |
| Collectors | One piece; 3" ball-and-socket outlets |
| Included | 755989 gaskets; BK109 and BK114 bolt kits; two CAS-105979 O2 harness extensions |
| Required connections | Matching Kooks exhaust connections; separate purchase |
Frequently asked questions
Can they bolt to my stock front pipes?
They require matching Kooks exhaust connections.
Are O2 extensions included?
Yes. Two CAS-105979 harness extensions are included.
What does the stepped size mean?
The primary tubing starts at 1-3/4" and increases to 1-7/8" before the collector.
Do you recommend tuning with these headers?
We recommend tuning with every header installation. Talk to us about calibration for your vehicle, exhaust and other modifications.
