View Single Post
      01-04-2012, 10:08 PM   #61
adamsclubs
Second Lieutenant
2
Rep
236
Posts

 
Drives: 2011 328i sedan
Join Date: Sep 2011
Location: CA

iTrader: (0)

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.