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I have BMC filters and Unobtanium HF cat downpipes awaiting my May annual service. It might be a mute point by then but will post any noticeable differences.
 

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They are right behind the rear wheel liner (1 driver side and 1 passenger side) to the right of each spring tower toward the side intake.

I replaced them with BMC and only notice a "maybe" higher pitch intake sound at higher RPM.
 

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How much are the stock air filters?
I just created a DIY thread where I do mention the air filters briefly:


http://www.mclarenlife.com/forums/mclaren-mp4-12c/83666-oil-change-diy-procedure-isg-delete-mod.html




Purchased through McLaren Chicago, then ran about $96 each. I, too, am curious if the BMC filters are superior, inferior, or equal to OEM, and how much they cost. It seems like I heard somewhere that the OEM air filters are as good as any out there..
 

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Someone should dyno these. I bet they don't make more power. The stock ones seem to flow quite well.

I know this is apple and oranges but when I swapped BMC's in for stock Lambo filters, the intake whistle was more pronounced. If all I get is more P1 "whoosh's" with the filters and high flow cat DP's, I'll be happy. Then again, I am a child. lol
 

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I know this is apple and oranges but when I swapped BMC's in for stock Lambo filters, the intake whistle was more pronounced. If all I get is more P1 "whoosh's" with the filters and high flow cat DP's, I'll be happy. Then again, I am a child. lol
I hear you. I plan to dyno them back to back one day.

XPRD
 

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2012 MP4-12C
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I know this is apple and oranges but when I swapped BMC's in for stock Lambo filters, the intake whistle was more pronounced. If all I get is more P1 "whoosh's" with the filters and high flow cat DP's, I'll be happy. Then again, I am a child. lol
FWIW I put in BMC filters and removed all of the foam inside the intake boxes. No idea about power, but the sounds were a welcome change. Lots more whooshes!
 
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Not yet. Been super busy trying not to die from this pandemic.
For 2 years? Man you were ahead of the game.
 
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2012 MP4-12C
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FWIW I put in BMC filters and removed all of the foam inside the intake boxes. No idea about power, but the sounds were a welcome change. Lots more whooshes!
The wooshes are from the foam removal, I did that with stock filters. I have other motives in this data.
 
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