Can a Rocket III take down the establishment, and rule this island

Sure enough, talk to the owner and if different, the tuner. If you trust them, have them complete the work. Would be good if you could establish a time and be there while they're doing dyno work.
 
They are frightened of the tremendous power that’s before them . Is the shop known for “tuning” and not just “tooning”.
Do you trust them to run your bike to the very edge ? Sorry to read the events hopefully just a hose . It sounds like your choice of shops is limited.