tuner?
If your just looking for more power, you may get say 20hp on a stock car, no way to tell really. the more mods you do, the more beneficial a tune will be. I'd wait till you have at least long tubes or something that more greatly alters the airflow of the engine, especially if you're planning on paying to have a tune done.
Trending Topics
If you have your own tuning tools, do it as often as you want, but when it's $500 a pop most would like to optimize their results by waiting till after the "bigger" mods.
I'd wait till after some headers at least.
The Best V8 Stories One Small Block at Time



