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My suggestion is add an air intake and go with a Dinan Stage 2 tune. I love mine and its a safe bet. If you go with a reputable authorized BMW dealer to do the tune, they are generally good about correcting any issues if they do arise... and the do occasionally. I had to bring mine back because I was getting misfires and limp mode about 8 months after the toon. It ended up being the original coils (9 years old at that point) couldn't handle the load with the increased boost and timing, so I changed the coils and also had them put new plugs in since it was already opened up (saved a few bucks on labor)... but the dealer gave me a 235i loaner for almost 3 weeks while they were figuring out the issue with Dinan. Since then it has been fantastic and better than before the issue.
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