Not a fan of K&N filters in dusty conditions, they allow particles >100 microns into the engine. Short of injesting huge chunks of gravel/sand, particles around 80 microns cause the worst piston/ring/cylinder/valve seat & guide wear.
I'm still running Genuine BMW sourced air filters, if I go aftermarket it will be ITG oiled foam.
ITG Air Filters - performance air filters for road and race vehicles
ITG PRO-FILTERS - BMW - X5 4.4 4.6 V8 (1999>) Performance Air Filters BMW - X5 E53 - 00 to 07_
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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!
Last edited by TiAgX5; 10-18-2014 at 04:20 PM.
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