I'm pretty sure the people at the dyno know how to strap your car down and run the dyno.
As for tuning- you don't just start changing the tune on the dyno.It should be 80% done on the street,then hit the dyno to check out WOT.
Alot cheaper to have someone like myself just do it. Nevermind will save you about 100hr's of research and questionable changes you will make.
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