Question !!!!
And unless you have experience tuning you will probable get more out of a professional tuner. But both handheld and taking it to a tuner are effective as long as you know what your doing
On my dads 2010 Camaro SS He had ted genety do a custom tune and it was a whole new car after he got done. You tell him the mods you have done to your car and he makes a tune that corresponds with the mods. If you get a tune i would talk with him. It's not cheap but it's worth it.
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