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      06-27-2012, 08:58 AM   #6
1sikbmr
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Drives: E90 M3 6MT
Join Date: Mar 2010
Location: New York

Posts: 3,153
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The factory air box on the M3 is probably the best design on the car. It has multiple points where cold air can get to the engine. Now the filter that they put is very restrictive so just a simple swap of the filter can gain some good numbers.
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E90 ///M3 6MT Atlantis Blue - Fox red
Gloss black grilles/Red gills|V1 hardwire|Painted reflectors|ZHP lighted shift knob|VMR V710 silver|GTS lip|Lux custom 8k kit|AA Green Filter| AA Pulley| RPI GTM Exhaust|Sosi x-pipe|BMW Performance Steering Wheel V1|
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