I have already taken apart the airbox on my 325i (3.0l n52 motor)
and replaced the air filter with a K&N unit and I can safely claim that the built in charcoal filter is not easily removable like the M5 is..Unless I'm wrong it looks like it is actually molded into the lid and would have to be cut out..I'm just gonna wait for an intake replacement from East Coast Intake or M Motorwerks instead...
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1988 E30 M3
Diamantschwartz/Black
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