ProVent filter is the best option!!
According to information available, the CCV requires some vacuum provided by the suction of the turbo for proper operation...
EHM mode can cause some problems.
Read and digest this information below and make your own decision:
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=80491&hilit
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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