I personally prefer a dyno tune. A street tune *might* make you more power but I'm always concerned about the tune set up with the temperature that day and hoping it'll adjust appropriately when the weather changes.
I also prefer a dyno tune because they're usually coming from a "shop" and not some guy who might or might not stand behind his work or be available if there are issues.
Are there good street tuning guys? Yep. Are there horrible ones? Oh yeah.
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