Miata 1.8L NB Basic Intake Flange Kit - Honda B series manifold Conversion
CNC machined flange which matches the 1.8L NB Intake ports with the exact shape of a Honda B16/B18 intake manifold. Flange is 1/2" thick and provides a recessed pocket for precise alignment of the runners to the flange. This flange is specific to the NB 1.8 head.
The flange kit is designed such that the fabricator removes the flange on the donor manifold where the runner meets the flange. The conversion flange is then welded onto the runners. The ports on the conversion flange have the exact geometry to transition the Miata 1.8L intake port to the exact shape of the Honda intake runner.
The kit also includes a support tab to be welded to the bottom of the manifold. This tab allows the stock Miata intake support to be used. This is absolutely required with a welded manifold. When using the support, the manifolds have been proven to be reliable in a race competition AND street driven use.
Flanges come in 4 variations with each variation specific to the donor B series donor manifold to be used. The 4 options are: Skunk 2 "Pro" series, Skunk 2 "Street" series, generic (Ebay, Aliexpress, etc) "Pro" series, and generic (Ebay, Aliexpress, etc) "Street" series. Please contact us if there is another B series intake which you are interested in converting. We can measure and provide a custom flange to your specification.
Due to the large variety of flange options, very low inventory of flanges is kept on hand. When there is no inventory on hand, flange kits are made to order and have a roughly 2 week turnaround from when the order is placed to when the kit is shipped. If a flange is to be made to order, we will reach out to you directly via email to confirm an expected ship date. As with all of our parts, flange kits are made in house by us in the USA.
Orders outside of the US require a shipping quote. If you're outside the US and would like to purchase, please select "pickup" for the shipping option and put your shipping address and email in the order notes. We'll contact you with a shipping price. DO NOT select the standard shipping rate as this will cause an order cancellation.