Billet ITB Adapter for the 1.8L NA Miata motor. This ITB adapter will allow you to bolt the individual throttles from the 20V 4AG directly to your  1.8L  head.

This adapter is specifically designed for the Silvertop 20V throttles, but the blacktop throttles will bolt up as well. The blacktop throttles have an odd diamond shape on the back side of the throttle, so you will need to spend a few minutes port matching our adapter with a dremel if you want to run the blacktop throttles.

You will need a standalone ECU or such in order to convet your Miata motor to open throttles.

This will only fit the first gen 1.8L Miata motor. The 2nd Gen 1.8L adapter is different and will be available soon.

Be sure to check out our velocity stacks, splashguard, and filters as well!