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I have Sergey Birioukov's (n63intakes.com) carbon cold air intakes in my m550. They come with K&N filters. I also have Sergey's stage 1 tune. I recommend this combo.
My impressions:
1. First, the intakes were installed. I noticed some diff in performance. maybe it was in my imagination, because the engine sound became a bit more loud and aggressive, but I believe I noticed a difference with intakes.
2. After the tune (and intakes on), my car became really joyful. It was not slow before, i admit that, but after the tune it became really fast. Not a torpedo like Sergey's own bmw, but really really fast.
I got a couple of error notices relating to intelligent driving systems (even though all systems works normally), but i hope they will disappear after I reset the car by removing the battery clamp. If not, i think the reason may be of not proper connecting of some detectors when removing my bumper and putting it on after installing intakes.
Overall, I am very happy i chose his tune.
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