The poor busa gets a big boost, shame it didn't take the day at the track. Your looking at some very serious grunt with any turbo on a big bike and your certainly pushing the limits of sanity. lol Is the head being done full on? Good reputable shop, flow benched, cc'd or just some mild porting? Either way the extra breathing should be noticeable. An old friend has the turbo'd Z13 dubbed "shot gun" out of penthouse, and while the thought of a turbo is interesting it aint for me. I only want sub 10's out of the Z13 and some exaust mods should achieve that. What sort of 1/4 times does your beast run do you know? I doubt I could push a bike like that hard but I'm sure it would do mad drifts, hope it all comes together nice for ya!