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Well nothing surprising tregarding a drop-in...changing the filter will have absolutely zero effect on performance.
All dynos have shown consistent 8-10 RWHP and 20 RWTQ gains with an intake (BMS and aFe), so I'd be curious to see Fletch F. Fletch's dyno procedures. Hood closed without proper fans to simulate airflow, then of course you can expect a loss of power. However that's not realistic since if you're driving, there's usually air hitting the front of the car. Usually.
Another member on F30Post who is also as methodical as olaosunt and has his 335i GT 8AT at the track often (and also owns a fast Mustang. Go figure.) gained a consistent and repeatable 0.1 and 1 MPH with just the addition of an aFe intake. Those are results in line with expectation...small, but results none the less.
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