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      01-04-2012, 11:00 PM   #62
DJ Apex

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Drives: 2006 330i
Join Date: Nov 2010
Location: Houston TX

Posts: 479
iTrader: (1)

Originally Posted by adamsclubs View Post
Axis, the 3" duct is air tight. The gap you see in the picture has no impact.

I had tried a 4" ABS coupler (actually a 3" coupler with 3.5" ID), could not fit in the tight space.

Apex's mod is the best you can get with the stock box.
not to mention i tryed over 8 filters from local auto parts