Longtime creeper, first time poster. I've come across several positive reviews for both tunes, and some neutral and negative for both. I was wondering which is more reliable for a daily driver, but still maximize engine potential. I have just about every performance bolt on mod for the 2.0 auto. I've heard Kevin is great, and his tunes being great; to him being irrational, losing his mind, and the tune not worth the money. Worst case, read one person claims his tune caused his head gasket to blow, and leaving cylinders all fudged up, which gives me much pause for purchasing it, but isn't completely justified as others have had success with it. Maybe there was a separate issue with that users vehicle, inherent flaw when that specific engine was manufacturered, some other anomaly, can't say for sure as the user (Trident15) didn't post much other than the tune being at fault. Nothing so bad for the RRM spectrum, but read people selling it off, despite them enjoying the performance and MPG gains they got from it, which doesn't make much sense to me other than them selling their dart, to it just not being worth the money. But figure the spectrum would probably be safer as it just intercepts IAT, MAP, and injector sensors. Per youngsmith53, just lowered the IAT temp during his logging, don't think he logged MAP though, which I'm sure it alters the pressure value there a bit as well. Any help and opinions would be appreciated. But thanks to all the contributors for making this forum useful (emount, Alpine, Youngsmith, trident, cntroller, etc).