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Jb4 has deffinetly more room to grow. My biggest worry was the fact that the b58 is a new platform and if a serious engine failure occurs the car hasn't been flashed. I don't think they would blame anything on a tune but with my luck lately I didn't want take the chance. I'm not looking to break any records, just want more power with reliability. Don't feel the need to squeeze every possible bit out. As long as it continues performing stock like with the added power I'll be very happy. Can't go wrong wth either one but I do suggest AA tune if you want to set it and forget it.......
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