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In terms of reputability, Epic is clearly the way to go. He is an actual tuner. Most of the cars racing in BMWCCA club racing use this.
Some of the other things you mention are not even tuners. As in, they don't even pretend to do any RnD. It blows my mind that so many people in this forum use tunes by people who are not tuners.
Can't go further into the topic as I don't want to be hit by the banstick.
I highly recommend people read up on tuners before getting their 25k engine's software rewritten. And by read up I don't mean read on the sponsored forum where a tuner can have things deleted and people banned.
There are many non tuners in the BMW tuning scene. However, if you look for people with an actual reputation, who have been around for more than 10 minutes you're left with ESS, Epic, Evolve and that's pretty much it.
To see what happens in this forum is depressing. The other day someone opens a thread about how their rktune got 17whp more than their ESS tune... I'm sorry, but are all of us on planet Earth? Because over here in planet Earth, you don't even gain 17whp from going stock to tuned. There is no way in hell you are getting 17whp from switching from one tune to the other regardless of who made tune A and who made tune B
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