It it nelps, road monster with slip ons made 44, stage 2 kit and matching high lift filter, no airbox lid and made 51 after set up on same dyno same day

Yeah that helps thanks.

...and there's the difference between bolting bits on and setting it up properly!

Which is what I learned that day: coule hundred quid fr someone who knows what they are doing is worth it...hence my 620 was a good un