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Everyone is going to tell you something different. In the end I think it comes down to your budget and how you feel about risking your warranty (although most will agree once you take off a tune you should be safe). I personally have mppsk and think it was more then worth it, I know power wise it's below a jb4 but I added jb+ so now I should either be on par or have slightly more power. If you want to save the money and get the most bang for your buck though jb4 is the way to go.
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