2000 Honda F4 special construction with NX wet nitrous system and a Performance Electronics PE3 ECU. It's about 29" tall. It is plated with up-to-date tags in CA, though you would have to be clinically insane to ride it on an actual public road.
This has been a half-hearted project of mine on and off, but mostly has been taking up garage space. I never really gave it the time it needs, and after a recent serious motorcycle wreck, I've decided I don't want to put the effort into getting it race ready. The ECU is only about a year old and it starts and runs poorly because I never tuned the ECU. Also, to be clear, I'm listing this as a project/parts bike and not a running, street legal bike because it is missing a few things like signals/horn/good ecu tune. Asking $2500. I will entertain offers. Bike is in San Jose, CA.
http://www.superfastmatt.com/2017/11/special-construction-honda-f4/