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      07-22-2012, 12:46 PM   #1
Alex.Devol
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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

http://www.knfilters.com/universal/apollo.htm
http://www.larkspeed.com/index.pl?a=i&k=s&p=338RC5052AL


Bullydog RFI

http://intakesystems.com/p-175-bully...ir-filter.aspx


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, 12:56 PM   #2
Sensible_
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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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