Know the landed cost before you order
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Finish your custom header with the right collector
Kooks 9912S brings four 2-1/4-inch primary tubes into a 4-inch outlet for your fabricated header. The 304 stainless slip-on design includes the patented scavenging spike and two A/B-style securing tabs.
SKU: 9912S
Match inside and outside diameters
The 2-1/4-inch inside-diameter inlets slip over matching outside-diameter primary tubes. The outlet is 4-inch outside diameter, so use that separate dimension to choose the connecting exhaust.
One collector per item
The collector is sold individually. Choose the quantity for your fabricated header layout, with the supplied tabs used to secure it to the primary tubes.
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 | 9912S |
| Application | Custom header fabrication; single collector |
| Primary inlet diameter | 2-1/4-inch inside diameter; slips over matching outside diameter primary tubes |
| Collector outlet diameter | 4-inch outside diameter |
| Collector design | Four-into-one with patented scavenging spike |
| Included | Two A/B-style tabs to secure collector to primaries |
| Material | 304 stainless steel |
Frequently asked questions
Is this sold as a pair?
9912S is sold individually. Order the quantity your header assembly requires.
What do the two stated sizes refer to?
2-1/4 inches is the inlet inside diameter at the primary tubes. 4 inches is the collector outlet outside diameter.
