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So like breather valves? That would make a difference if the main filters were restrictive enough that the two smaller ones added flow which is tied to the capacity of the inlets.
Breather valves are cheap enough try it out!
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2009 e90 335i
6MT*Sport Package*Factory Location VRSF Inlets/Outlets*VRSF 7"HD IC & DCIs*FTP Low Temp Oil cooler Thermostat*VRSF DP & 335is Mufflers*Turbosmart Diverters*Custom Tune*550 Clutch & Delay Valve Removed*e93 M3 FSB*Custom Seeping Oil Pan
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