Thread: ecis intake
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Old 05-10-2002, 07:41 PM   #3
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Join Date: Jan 1970
Location: Alexandria, VA
Posts: 3,083
My Ride: 2001 325ci
Stock I believe is not difference but ECIS is

The only difference on the ECIS is the filter size. The 325 uses a 6 inch filter and 330 uses a 7 inch. I don't know why there is a difference in filter size. The old e36 325/328 used a 9 inch filter! From what I know, depending on the filter diameter, a 6 inch filter will support a car up to 280 HP and a 7 inch is like 340hp. The difference could be the 330 draws more air and requires a larger filter but again the e36 used a 9" so it makes no sense.
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