I too have an AFE Proguard 7. Working in the diesel industry you see stuff from the sales side. This version of the AFE filters is available on many Dodge, Ford and GM applications. If it is good enough for the mid-size trucks, it is good enough for Thumper. The key is to select the one for the 3.7 Liter Liberty. That is if the information on the website still does not include the 2.8 Liter engine as an option.

It is dirty currently and I bought a Pure One recently for temp use.

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FWIW,
Hoosier CRD

#1 Liberty: '05 CRD Limited Stone White
(SOLD Dec. 2013)
#2 Liberty: ???
"Why guess when you can know?"- Carroll Smith

Using the AFE Proguard 7 as well now, although I used the Wix one before.

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2006 Liberty CRD Limited

Provent @ 43,000 km
SEGR in progress
SAMCO Sport hoses @ 48500 km
Goodyear Wrangler Duratrac LT225/75R16

I think it should be 42329, right? The 43629 is a cylinder shape.

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06 CRD Sport, GDE Hot Tune, Suncoast TC, Frankenlifted, OME Shocks and Springs, JBA Upper Control Arms, Bauer HPE Thermostat, in-tank lift pump, Squatch Provent Kit, LT245/75R16, silicone hoses, gasser airbox, remote start, fumoto, flowmaster, factory skids

06 CRD Sport, factory skids, Fumoto Valve, ARP studs, LT245/75R16, ProVent

I may be crazy, but I installed my ProGuard7 yesterday during my lunch break and the motor seems pretty happy.

The ProGuard7 is now list for the CRD as well as the 3.7L

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2006 CRD - GTB2056 turbo by Dieselguy86, Eco Trans Tune, Lift Pump, Week's, HDS Tstat, Racor Filter, ARP's, OME 790's+Top Plate, JBA 2.5", JBA UCA, Moab's+265/75R16, ARB Bull Bar, 4.10's, TrueTracs

Your not crazy...anytime a new air filter is installed these CRD react in a good way. For sure cleaner is better. I clean my K&N every 5k during my oil changes. Always runs better.

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05 Liberty CRD Sport with Leather 115k
GDE ECO, No EGR, no FCV, (system gone)
Oil Drain plug P/N 090-039
K&N Air Filter, 2nd gen Fuel filter head
NEW Rockers & lifters
Mobil 1 0w-40
Stant 13519 195 deg inline Thermostat.
0 281 002 845 MAP
Etecno GX3123 7v Glow Plugs
Advance Gold 800CCA Battery
Traded it for a Quality VW TDI

I run a K&N in the CRD. I just clean it every oil change and only use a light dusting of oil on it. I also run a k&n on my 05 evo. Put it in with 10 miles on the car and it now has 53k.

Only issue I have ever seen with a K&N was it killing a Maf. That was due to the person using to much oil on the filter.

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05 Liberty CRD DD/ski slut
Lifted,hottune,Full exhaust
05 Mitsubish evolution SSL
450awhp/400awtq autocross slut

I have been using Napa/wix but some one did post a comparative analysis figures where ACDelco out performed all in our application CRD and wix Napa was hon able performer on the podium at 2 or 3 .

NAPA Gold here.

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

x2

NAPA gold is Wix, and has more pleats than FRAM.

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Silver 2006 KJ 2.8L CRD Limited:
GDE ECO Tune / Fumoto Valve / E-Tecno GX3123 7v Glow Plugs / 2nd Gen Fuel Head / Mishimoto RED Hoses / Rockers/Lifters @ 114k / Hayden FC + 11 Blade Nylon / Sears P1 Battery / Transgo 45RFE-HD2 Reprogramming Kit / Timken Front Bearings

I'd like to try the ACdelco air filter but cant find them for sale locally.

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U.S. Army Retired

AFE is best compromise between flow and filtering. I use one is everything I can.

DOC

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2005 KJ CRD Ltd Detroit TrueTrac Bilsteins G2 GDE "HOT" ECU GDE TCM "Tow Tune" "euro" TC SEGR Weeks Elbow New HG at 130K ARPs Clean CAT aFe Filter Magnaflow Exhaust EHM Cumminos In-Tank Lift Pump Hayden Fan Clutch Nylon Fan VH Enabled with GDE lower shutoff point Recalibrated Temp Gauge Tekonsha Prodigy Sears P-1 ZDDP