This flange converts the DOHC ZC intake flange to be able to use the standard d-series factory or aftermarket intake manifold or a d series supercharger. ZC superchargers are nearly IMPOSSIBLE to find so this allows you to use the D16 supercharger. We have them in stock and ready to ship. Comes with flange and hardware to install. Please message any questions you may have. Please check out our EBay store for many more CRX and Honda parts. Thanks