Price: $287.99
Pros: Intake tube design.
Cons: K&N filter
Recommended? Yes

Comments: This kit came installed on the jeep when I bought it so I can't give an accurate comparison from the stock intake design, because I never had it. The first thing I did was clean the filter and noticed how easy it was to see light through it and how thin the filter media was. I then realized how the inside of the intake tube and throttle body were coated with fine talcum power-like dirt. Just a thin layer but enough to cause my throttle body to turn black. I eventually decided to trash the K&N filter and just installed a paper element cone shaped filter from Orielly's. It was easy to make the paper filter fit securely. I'm not a fan of K&N filters since they let the fine dirt through. But the intake design is solid. I like the straight-shot style tube and the super smooth finish of the inside of the tube. It's also very easy to remove and re-install the intake with nothing but a small flathead screwdriver which comes in handy when doing engine work. The quality of the kit is fantastic and I have no doubt it will last the life of the vehicle. I'm sure the stock airbox works just fine, but I have no doubt the K&N system is feeding my engine all the air it wants with no interruptions.

Price: $225.00
Pros: Sounds great and performs well
Cons: None
Recommended? Yes

Comments: Love this kit. It allows the jeep to breath better and it sounds almost as if the engine is turbo charged. It has that same high pitch hiss.

Price: $500.00
Pros: gas mileage
Cons: expensive
Recommended? Yes

Comments: good for added power and good addition to a throttle abody spacer.

Price: $190.00
Pros: Good lively sound, Throttle response
Cons: Hard to stay off the gas
Recommended? Yes

Comments: Good sound, improved throttle response, might have some gains in hp, Unlikely to gain any Mpg, hard to stay off the throttle. Bought new in 2009 off amazon for $190 plus $10 for shipping

Price: $250.00
Pros: Throttle response, sound
Cons: Price
Recommended? Yes

Comments: Easy to install and sounds great

Price: $150.00
Pros: Looks good and souns good if your looking under the hood
Cons: Got to reoil it, the only time you hear it in action is when you are hauling ass or under the hood reving
Recommended? Yes

Comments: I love kn and their products never let me down. Looks good and does what it does.

Price: $215.00
Pros: Smoother ride, more power, easy installation
Cons: none
Recommended? Yes

Comments: Just put it in last night, my ride seems smoother, lower rpm's; I highly recommend.

Price: $259.99
Pros: Increased throttle responsiveness, a little more power, minutely better fuel mileage
Cons: slightest bit too much oil effects the mass air flow sensor
Recommended? Yes

Comments: Its a good kit, ease of installation was pretty good, noticeable gains across the board.

Price: $200.00
Pros: more airflow and better filter
Cons: the tube itself sets out a little to tall from the throttle body making its difficult closing hood with throttle body spacer..
Recommended? Yes

Comments: its k and n whats not to love

Price: $239.99
Pros: Aggressive intake tone, low-end torque gains, HP gains in powerband.
Cons: Not isolated from heat of engine compartment. Have to clean filter regularly (required of any K&N Filter)
Recommended? Yes

Comments: It's a K&N - pretty much speaks for itself.

Price: $215.00
Pros: Some power boost.
Cons: A little worried about "recharging" the filter, possible moisture in the intake.
Recommended? Yes

Comments: It's easily installed, seems to add some power to acceleration.

Price: $250.00
Pros: -Million mile warranty -Washable -May or may not improve air flow -Filters way better than paper filters, and a stock airbox.
Cons: -Requires a recharge kit for cleaning. -Location sucks to begin with, but the provided heat shield could be better.
Recommended? Yes

Comments: I can't remember how much I paid for my FIPK.
It was a few years back, and it was when I first started working on my XJ.
Since it was the easiest of the mods I had lined up for the summer, I slapped the FIPK kit on, and took er' for a spin.
The first thing you'll notice is a deeper exhaust note at lower RPM's.
Throttle response may or may not seem snappier.
As for gas mileage improvements, I didn't really pay attention.
Either way, you don't have to keep buying stupid paper filters anymore, so that's a big plus.

Price: $320.00
Pros: More hp
Cons: none
Recommended? Yes

Comments: Easily installed. i built a metal box around mine to keep the mud and water out leaving the back open for air.

Price: $1.00
Pros: GoOD SO FAR
Cons: none yet
Recommended? Yes

Comments: already installed when purchased, not sure what difference it made but no complaints.

Price: $150.00
Pros: Love it. Improves gas milage and needed power
Cons: None
Recommended? Yes

Comments: Got it with the truck. Its the whole shibang. I cleaned up the filter, and piping when I got it. I love the throaty intake sound, and the extra power when needed. Love it!

Price: $0.01
Pros: Came with the Jeep so I have no stock experience to compare to.
Cons: A bit of a chore to clean out.
Recommended? Yes

Comments: Seems to work well, but as I said, I have no stock Jeep experience to compare the performance to.

Price: $165.00
Pros: added fair amount of HP, Now my top speed is around 90 mph instead of 70. Slight improvement in gas mileage.
Cons: gap around tube at heat shield, butts up against intake manifold with flexible coupler and a couple of clamps, not a perfect fit. Chintzy for the price.
Recommended? Yes

Comments: I think it would be very easy to make your own with a cone filter and the stock tubing. or even PVC.

Price: $45.00
Pros: more horsepower
Cons: expensive for actual cool air kit
Recommended? Yes

Comments: I installed the K&N cool air intake by using 3.5 in exhaust pipe and the oem clamp just shoved it in there

Price: $250.00
Pros: More responsive throttle
Cons: Gets dirty fast. More susceptible to water/mud than stock intake
Recommended? No

Comments: Power gains are barely noticed. Its nice to have, but in the jeep world your money would be better spent somewhere else.

Price: $300.00
Pros: SOUND!!, HP, Look
Cons: ?
Recommended? Yes

Comments: K&N FIPK for WJ grand Cherokee. I bought one used off a JF member for $150 and have never been more satisfied with probably anything Ive ever purchased, automotive or non. The installation was fairly straightforward took and hour in the dark with basic tools. Now that I've done it once it would take me 15 min on and off. The first thing you notice is the SOUND!! Other than a woman's moans I dont think I've ever heard something so great(that I made happen I probably spent 20 min roaring up and down the empty parking lot with a huge grin on my face. I have the 4.7 High Output V8 which you could hear but was comparitively silent before. It was like a tiger finally released from it's cage. I dont have a dyno but the power was noticably better. I could feel myself pulled back into the seat as the front end lifted and she jolted ahead from full stop. Merging onto traffic is something I look forward to now. I know that no matter what I can lay the hammer down run screaming ahead without fear. Definately the first thing you should purchase for any vehicle. I'll have one waiting at home for every vehicle I ever purchase.