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a) Dyno's are comparison tools for before and after. Absolutely.
b) 0-60 pulls are ok but to be honest. To much variables here. Traction control. Underhood heat, ...
What I and many of my friends always did. Get on the highway or autobahn.
It's far more accurate to test that in a range where not all happens within milliseconds.
If a mod or tune or whatever really gains performance. Do several pulls. For example 3rd gear - starting at 30mph and floor it till red line. Stop the time or use an iPhone app or something similar.
Do that with 4th gear several times, too and take the avarage between all 3rd and 4th gear pulls.
Leave the car rollin at +/- 50mph for a minute or so between the pulls to get the temperature out of the engine bay.
If the new tune really helps you will see it more obvious as here we're talking about loooong pulls were it's all about torque and hp and not only quick shots where a lot is happening at the traction level.
just my2cents...
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