I just bought a 2006 XLT 4X4 with the 4.0 and was wondering if a cold air induction was really worth the price in relation to HP change and mileage gain. Any words of wisdom??

 

You probably wont notice that much power gain or mileage gain with just a cold air system. I know when first i install mine the only thing differant i notice was the noise of the air being sucked through the filter.
I have Cold air intake, exhaust, and an electrical fan on mine and to be honest with you it doesnt seem anymore powerful from the day i bought it. However all that togeather did help my gas mileage quite a bit.

 

Why does the electric fan make that much difference and how does it operate? Is it thermostatically operated or with a switch. I have an electric fan on my street rod and I have it set up to come on at a predetermined water temp BUT I also have an overide switch so I can turn it on when in traffic. Would I need something similar??

 

just to clear something up, it's technically not CAI because it does not change the location of the airbox.

changing to a higher flow filter or filter and pipe doesn't yield much until it's paired with an exhaust, because you are letting more air in without getting it out quicker.

E-fans are controlled thermostatically