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I know this is a JB4 thread, but doesn't ESS offer a straight up tune (no other parts required) for the N63/50i? I put one on my 2012 50i and dropped 1+ sec off my 0-60 times. Price was ~$1k at the time a couple years ago.
Thought that would scratch my X5M itch. It did for a while at least. haha
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