Our 4-2-1 race header is the recommended header choice for all K24 Miata swaps. It's an affordable high performance option that supports stock engines as well as 300whp builds, and fits in the tight space constraints on the right side of the Miata engine bay.
This header features:
A 4-2-1 runner design
304 brushed stainless construction
Three welded true merge collectors
Proper cylinder pairing (4 and 1 paired, 2 and 3 paired)
1.88 inch primary runners
2.13 inch secondary runners
2.5 inch collector
2.5 to 3.00 inch transition
Full V-band assembly
O2 sensor bung
All necessary gaskets
Due to this type of design, clearances below the engine are extremely tight. Because of this, headers ship with a custom slim-fit flywheel dust shield. Additionally, this header sits slightly lower than other headers we have produced. The minor reduction of ground clearance is behind the front wheels and oil pan, and has not posed an issue on our test car with a 4” pinch weld ride height.
*This header is specifically designed for K24 fitment. If you’re using a K20 block, minor modification may be needed.
**Your exhaust must include a flex pipe right after the header. We do not warranty cracked headers from improper use; therefore a flex should be installed in order to expect lifetime use from the header.