Its the Jspec DOHC ZC, and "B" series motors suck for FI because of vtec. This is information givin to me by modacar. They have a B20/B18B supercharged that lays down 347 WHP... These are the only "B" series motors I would use for FI. Dont get me wrong, the vtec is awsome for ALL MOTOR aplications. I just think they are played out. Hey do you know if the D16A6 and the ZC have interchangable internals?