I notice that a lot of you replace their OEM airbox with a cold air intake.
I do realize that this inreases "breathability" for the engine and thus more power/inreased MPG,
but is this really neccasary or is this more of a CRD issue with inlet temp. control?

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07 Cherokee/Liberty Limited 4x4
CRDStu 2.5" Lift, JBA's 4.5 UCA's
ARB Winch Bar, WARN XD9000 Winch
Light-Force 170's
3.7 Petrol / Auto
Sun Roof
Tow Pack,Scan GuageII
Reversing Camera
(pretty much stock, really)

The CRD issue is that the stock airbox with a straight in tube - tends to collect water while driving in heavy rains
- and so we replace the airbox with a stock v6 airbox - that has the airscoop up under the hood
I wouldn't call that a cold air intake - the original CRD box is closer to that

however some of the v6 guys looking for more power have gone to the aftermarket cold air boxes.
they probably do increase power and they normally go to an oiled foam filter at the same time
but those don't filter the air as well - and they will help your engine wearout faster.

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2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur

I would not say a lot have replaced the stock airbox, more like just a few overall
Best to date for me after 4 different setups, including a CAI, is an Amsoil filter in the stock box with a 3 inch dryer vent hose from the grill back into the box

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited