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I think the motor is being confused with another, but yes you are correct about the intake, it is a larger size throttle body and intake runners as found on the y8. The head is also the same casting. The 3-stage vtec utilizes lean burn and a 2 valve swirl action just like the D15Z1, only they added a 2nd vtec solenoid to kick yet another set of lobes into action and provide approx 128HP. Research 3-stage vtec on google there is good articles and some claim near 50mpg in the stock 4dr m/t versions at 50mph.
The ecu for these is VERY rare and I'm going OBD-1 anyway so it's not a concern of mine. I will probably be using a D15Z1 ecu and installing a VAFC to activate the 2nd stage and enrich fuel mixture. In the meantime we have to see if a regular vtec ecu can be tuned to read a wideband o2 sensor, if so my tuning buddy can use a acura GSR ecu, the intake butterfly control to switch to 16V and the vtec function to grab high cam....
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