I have never understood why anyone would swap from a B18A to a B16A. There really isn't anything you can do to a B16A that you can't do to a B18A. Sure, the B16A revs higher and makes more top-end horsepower, but the price and torque loss is not nearly worth it. I would consider nothing less then a B17A for the DA9 chassis, ideally an LS/VTEC hybrid or a B18C would be used.