BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > help! air intake options for D's

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      07-22-2012, 01:46 PM   #1
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help! air intake options for D's

Been really searching hard the last few weeks for an air intake / open air filter which is going to be compatible with the N57 engine. I have quite a limited understanding on what makes an air filter compatible with an exact model, but since there are no real model-specific options out there for the diesel BMW's i've been looking at universal stuff.

Any opinions or advice on the following would be really appreciated:

K&N apollo


Bullydog RFI


Im looking mainly for improved sound, but obviously improved performance is going to be a + and heatsoak is going to be a - .. if either are going to be potentially damaging then thats a big - so a heads up would be great!
Any advice on how much of either i can expect would be great!

also my car is a 325d, if i find a filter advertised for a 335d what stops that being compatible with mine, other than maybe space in the engine bay?

thanks in advance to anyone who can help.
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      07-22-2012, 01:56 PM   #2
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Drives: 2008 E90
Join Date: Feb 2012
Location: London

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I have used K&N filters for years and had no problems, gains are very very slight in myo but its not like they cost a bomb.

Some people complain the K&N filters screw up the MAF sensor due to the oil in them but this has never been an issue for me. Cant answer any of your other queries though.
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