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Air Box Removal

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Chopped View Drop Down
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    Posted: 30 Sep 2016 at 8:52pm
I have a K&N cone fitted in the air box (below pic) of my E88, could I remove the box & bolt the air filter straight onto the air flow / air intake pipe.

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Mike Fishwick View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike Fishwick Quote  Post ReplyReply Direct Link To This Post Posted: 01 Oct 2016 at 9:40am
Putting the air filter directly on the inlet pipe will cause the engine to breathe warm air, which will reduce power, increase noise, and increase the risk of pre-ignition (pinking).  In order to avoid this you would have to divide the filter from the rest of the engine bay - a task already performed by your air box.

Apart from that, thre are plenty of good reasons to get rid of a K&N filter, for apart from the glowing testimonials of the manufacturer, the original paper element does a far better job at filtering and protecting your engine.

Some people like to think that a K&N filter increases the performance of their car a liittle, but when You question the amount of improvement, and how they are so sure of it, the 'improvement' usually turns out to be a feeling and nothng more.

Proper lab tests of K&N filters state that when new, the K&N has a very slightly higher flow rate than the standard type, but when identically fouled, the original has a much higher flow rate.  The '50,000 miles between cleaning' claim must be after the car was used in an operating theatre!

K&N filters are just a fashionable noise-maker, which does nothing else well.


Edited by Mike Fishwick - 01 Oct 2016 at 10:42am
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