I figured it should work since the injector multiplier changes with the 450cc to almost half, and since the hondata tuning manual advises to tune unboosted first then tune boosted this should be the same thing. the a/f may change but only when the psi or vacum does, whether its -10 vacum boosted or n/a its still -10, the only diff is at what rpm. I intend to go ahead and set the target a/f to what I want when it's boosted, since the turbo goes on next week, and I am currently seeing 11:1 and 13:1 as my part throttle and wot. thanks for the help just wanted to confirm my line of thinking since this is the first one I've tuned.