Well it doesn't really matter shit about the numbers! Get on 5 different dynos, they'll all read different. Some very different- tuners can fudge it easy enough. It's really only for people that like saying they have a xxxrwkw car for the brag.
Best thing is to do a base run, and then tune to see to real results on the same dyno. Even better, go to the 1/4 mile before and after.
You can buy the uprev tuner pack, and take it to any tuner you feel like as the software is free to download. I would use jez, or unigroup. Just buy it from the us or uk.