Quote:
Originally Posted by rhodius
I'm in the same boat as you. I have a 2012 550i with N63. Still looking to get improvements, all I want is a little more responsive and quicker acceleration.
I was looking at JB4, but someone suggested looking at activeautowerke. I looked at their website, it looks like the chip tune is only for N63TU or S63TU. Can someone correct me please?
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I'm new to bmw modification world
But in a couple of months I install a fabricated cai and tune it