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Just posting this for those with the E71 35i, I have a 2011 BMW X6.
I recently purchased the BMS intake for the n55 engine in my car, and it drove great for a few days...lots of swoosh sounds and all that.
A few days later, I replaced all my spark plugs with new ones (preventative maintenance since I have 60k miles) and the car started misfiring the next day...thought it was a defective spark plug so I had my indy mechanic replace it.
The next day, I was experiencing more misfires. Changed the ignition coils but still it was misfiring. It misfired under medium throttle on the highway, around 2k rpm.
Finally, we realized that the engine was destroying the new spark plugs (OEM BOSCH). So we ordered the BMW Bosch plugs from the dealer, and I put the stock air filter back on...car runs back to normal.
I think my problem was too much air, not enough fuel. I am running the stock ECU as well. Just wanted to put this out there incase it helps anyone out as I could not find anything related to this issue.
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