Is it worth getting shiny down pipes?

[xlewisbdx]

Basically they wire the bike up to a rolling road machine, rev the nuts off it in every gear, then assess the results in graph form.
To the trained eye it speaks volumes about a bikes performance which can then be adjusted where necessary to get the best out of it.
Unless you have a problem you really can't fathom out then there's no real point in Dyno'ing a restricted bike, it's actually aimed more at performance/race bikes.

When I get my restrictors off I will take it. How much does it cost? Would it improve performance?