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I went with a Dinan Stage 1 tune installed by my BMW dealership. When my N55 hydrolocked after only 2,600 miles, I was happy to get it back to the dealership and not have to worry about who would be picking up the tab for a full engine replacement.
As far as CAI are concerned, they look and sound great but I believe it is the ultimate rip off for our engines in terms of power output.
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