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After extensive dyno and track testing, this manifold delivers the best power, fitment, and reliability over everything else on the market. It’s perfect for the K series Miata swaps, but also works for other RWD K swaps in S2000s, BMWs, Nissans, and much more.
Features:
We recommend pairing the manifold with an OEM style metal gasket only. The plastic thermal gaskets can cause bolt heads to crack off, and in some cases other brands of manifolds crack.
If you are using a K20Z3 cylinder head (RBC) then order the manifold for the K24A2 (RBB) head as the manifolds are identical.
Use an idle air control (IACV) from a 2003-2005 Accord or 2003-2006 Element, Honda part #16022-RAA-A01. OEM or aftermarket units both work well.
**K24Z3 R40 manifolds ship with larger injector bores for the larger OEM injectors supplied with these engines. If you want the smaller K20A/K24A style injectors please specify in the special instructions at checkout.