DCI with 2" inlets

N54TT

Corporal
Jul 21, 2020
136
41
0
Ride
2013 335is
Is there a specific type of DCI that's recommended for 2" inlets? Only reason why I ask is because the inside diameter of the 2" inlets is much larger then the supplied aluminum pipe the BMS DCI comes with which appears to fit more snug with the oem inlets. I'm not sure if any of this makes a difference or not or if the 2" inlets just need to be clamped all the way down.
 

typedRew

Sergeant
Feb 25, 2019
412
221
0
Ride
2009 335i xDrive
2inch inlets is only a reference to the turbo side of the inlet. the rest is the same as it would be on 1.75inch version
 
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N54TT

Corporal
Jul 21, 2020
136
41
0
Ride
2013 335is
2inch inlets is only a reference to the turbo side of the inlet. the rest is the same as it would be on 1.75inch version

Got it. Not sure why, but my VRSF stock location inlets seem to have a larger inside diameter where the DCI mounts. The included pipes on the MMP seem to be larger then the BMS for example


 

martymil

Major General
Sep 6, 2017
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S65 1m
All the rest when they get little dirty restrict flow.

The BMS ones are so big they just out flow the competition.
 

Jeffman

Major
Jan 7, 2017
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I actually test the air resistance of my BMS DCI filters with a shop vac. They actually make the shop vac whine a lot more when dirty than when clean, indicating there is some flow restriction. After cleaning and refreshing the DCI filters with oil the shop vac whine is gone.
 

martymil

Major General
Sep 6, 2017
3,331
1,906
0
Down Under
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S65 1m
Yes but even when restricted they flow more than other brands clean

This is with the 2 or 2 1/4 id filters
 

N54TT

Corporal
Jul 21, 2020
136
41
0
Ride
2013 335is
Now the only thing I gotta figure out is what gap to run on spark plugs when using Precision Raceworks coil plug upgrades.