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Most increase intake roar, but some folks like that. Most offer much less protection to getting water in the system. Fuel consumption should be unaffected (up or down). The one area often discussed for engine damage results from the frequent used of an oiled filter, with the story going that oil is blown off the filter onto the mass airflow sensor, damaging it. I've heard both sides of that arguement (K&N categorically denies it, says there are no proven cases of it happening). I have no idea whether it's true or not.

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The main thing to watch for (along with the previous replier's good comments) is the tendency to make the engine run leaner/richer. Just remember, when you adjust or change one component on the vehicle (and especially with aftermarket products) it may and usually does affect another system. i.e. you slap a pair of headers on a car, it'll change the operation of various systems.

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I have not found any problems with cold air intakes. The only problem that can arise is increased fuel consumption because you can't keep you foot off the pedal. I intalled one on my 2004 dodge durango 5.7L HEMI and I'm pushing about 360 horses now, with other modifications as well. I love the intake. Great throttle response, power and torgue in the mid to high end range and of course the roar that comes out of the engine compartment now.

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I'd say the biggest drawbacks might be:

1. increased intake noise

2. Danger of water intrusion in deep puddles

3. Not much horsepower gain for your money and trouble, unless you include other mods as well---in some cases of badly designed systems, no HP gain at all. At best, you'll gain a few HP at extreme RPMs. CAI favor larger displacement engines.

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I have cold air on all three of my vehicles and I love it, but I do agree with the others about it taking in water, I have noticed water spots on the inside of my Cherokees intake. I have a throttle body spacer ( a spacer is the best thing I have found for increasing power) on my Bravada, when I put a K&N filter on my cold air intake I noticed a gain in mid-range power and about 1 mpg more ( when your getting 14.5 mpg, 1 is alot).

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