It also increases the amount of dirt consumed by the engine... OR oil. You get your choice. MAF or dirt. Of course, they filter well once they're pretty dirty, but then they don't flow any better. All I know is the paper filters never killed a MAF and the engine can redline with it- so it must flow enough. 
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2002 Freelander
2000 DII w/CDL
1967 SIIA 109SW
Former Rovers
2004 Modded "S" Disco, R.I.P.
2004 G4 Disco
2002 Modded Freelander
1995 Modded Disco
1994 D-90 #8
1993 NAS D110
1990 Range Rover County
1973 SIII 88
1972 Range Rover 2 door
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