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No, with headers it just doesnt work. The fuel trims get out of wack and the car doesnt run right, because it relies on O2 sensor feedback - which is now wrong because the sensors arent in their original location (yes, its that sensitive).
You shouldnt get lower fuel economy, at least not with my version. My long term MPG is 23.5, and on all highway I'll get 35. The N52 was designed to run with no MAF, that is the mode I use, it runs like it's factory stock because it is (mostly).
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