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You have 2 options.
1: modify then take it back to the same place.
2: take it to somewhere that is "accurate", then modify then take it back to them.
Depends how anal you are about a number that to be honest, will never be exact.
Imo RR are good for finding out the increase in power you...
If your car makes over It's stock bhp (ps), everyone on here will say Its over read.
RR are good for seeing power increase in your engine after modifications. So once you have done the modifications you said you're going to do, take it back to the SAME place and see what increase you have made...