Custom tune vs. Reprogrammer
Custom tune if you are done modifying your car.
Programmer if you're not done modifying.
If you don't mind spending hours and hours reading/learning about tuning:
Hptuners and custom tune it yourself.
It's better if that "well-experienced tuner" is yourself.
Dyno tuners old tend to mess with fueling and spark at WOT. When you're doing it yourself, you can properly tune idle and part throttle.



