i dont know but u could call Endyn motorsports at 817-924-9334 and tell them u have h23/h22 motor and a unlimited bank roll and u wnat it to be n/a an i bet he will build the baddest honda motor conceviable since he been making milestones in the peformance world since 1959. just check out his website to see all of his inventions,creations,innovations,advances, and developments. u got enough cash u can make damn near anything happen.