I just changed my standard paper air filter today on my 330i M Sport Touring.
What did I change it for? A BMC panel filter. They seem little mentioned on here but I rate them highly, Italian I believe and made very well, oiled cotton type panel filter. BMC also make replacement equivalents of the Gruppe M, namely CDA which are often used on Ferraris.
So far I am impressed, and already use a panel filter on my Integrale so know they work well on forced induction at least.
OK! Spent this morning cleaning the beast in the sunshine so she could be treated to her new innards...
Finally fitted the Pipercross performance panel filter and have some vids...
1) Engine rev sound test with OEM filter in the air box
2) Video showing how the old filter goes and the new one goes in - not really helpful, was more just for my own amusement
3) Engine rev sound test with Pipercross filter in the air box
Is there a difference?
Hard to tell when only doing a quick nip to the supermarket through traffic, plus it's not worth the grief if I destroy the shopping!
Will do a proper run later and try to video some 'acceleration revs'.
There is certainly a slight change in note, a perhaps 'less restricted' sound? Maybe that's just my imagination, but it does sound like there is more of a snarl at the higher revs. HARD acceleration DOES seem to feel smoother, but again, was tricky to tell in the conditions today.
Hope this helps anyone out there.
I've just viewed the videos. I'm just wondering why your car sounds much louder in both the videos compared to my 330ci? Were the windows open when you recorded it and was you in a garage or enclosed area? For the camera being inside the car it sounds VERY loud/deep. By the way the videos were very good!
There shouldn't be much of an increase in noise as the OEM airbox is designed to cancel the noise from the air intake.
In my experience you only get an increase in noise if you remove the OEM box and add a cone filter.
Potentially the advertised benefits from using the pipercross panel filter with the orignal airbox is increased airflow and increased lifespan for the part.
ps it's great to see the vids adds so much ;o)
Videos were done in the underground carpark of my building, looking at the second vid (replacing the filter), seems my roof was down so the 'volume' will of course be higher.
I have really only noticed an engine note change when it's under high revs, perhaps a little more throtle response noticeable at the lower end.
Agree with this. No noticable noise change when I upgraded mine to Pipercross replacement panel filter. Benefit will probably be greater with the forthcoming ECU upgrade though. I paid £37 versus the std replacement cost of around £10, but I hope it will last longer (and of course can be cleaned).
the thing you are paying for with a foam air filter is their ability to continue flowing air way past the point a paper filter would be clogged...extended service life and reusability
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