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Bring your custom header primaries into one collector
The Kooks 9909SM stamped merge collector joins four 2" primary tubes into a single outlet for a custom header build. Its 304 stainless construction and scavenging-spike design give your fabricator a defined collector specification, with the inlet, merge and outlet measurements kept separate.
SKU: 9909SM
Three sizes with three different jobs
The four inlets have a 2" inside diameter to slip over 2" primaries. The merge section is 3-1/2", leading into a 4" outside-diameter outlet. Use the inlet for primary fit and the outlet for the next exhaust connection; they are not interchangeable dimensions.
For a fabricated header
Two A/B attachment tabs are included. This is one collector for a fabricated assembly, not a vehicle-specific bolt-on header. Plan the primary layout, support and joining work with the fabricator.
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 | 9909SM |
| Material | 304 stainless steel |
| Design | Stamped 4-into-1 slip merge collector with scavenging spike |
| Primary inlets | Four 2" inside-diameter (ID) inlets |
| Merge diameter | 3-1/2" merge section |
| Outlet | 4" outside diameter (OD) |
| Included parts | Collector and two A/B attachment tabs |
| Quantity | One collector; sold individually |
Frequently asked questions
Will the inlets fit over 2" primaries?
They have a 2" inside diameter for that slip connection.
Is the outlet 4" inside diameter?
No. The outlet is 4" outside diameter.
Are attachment tabs supplied?
Yes. Two A/B tabs are included with the collector.
