I installed a filter minder on my CRD last year! It was very easy to install, ordered it off ebay....
They come in different negative pressure ranges for different engines, big to small diesels..
Simply drilled a hole in backside of airbox slightly smaller than the vinyl tubing and worked the tube into it for a very tight fit...
Basically the same setup that came on my Dodge Cummins!

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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited 
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve