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I know this has been posted before but I was looking for some fresh ideas and advice. Cold air intakes... Does anyone swear by them? Does it increase the gas milelage, hp and low end torque by that much? Thanks for the help!
 

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x2 on the question
 

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Drives by Braille
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there really isnt much to improve uppon the stock TJ intake. Its smooth with minimal bends and shoot right into the throttle body. To save some cash, but a universal cone filter and place it over the end of the stock intake tube. Remove the air box and what not and there ya go... of course it will make the jeep a bit louder as well.
 

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i would put a true flow filter in the stock box. high flow and stays that way even when there dirty. the stock intake tube can be modded by cutting off the flex part and adding a piece of reinforced rubber tubing over the smooth section and attaching it to the box. thats my plan anyways when i get off my lazy ass. will it help with mileage prolly not but it will flow better then stock.
 

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Jack Lives Here!!!
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For my experience I'll put it this way. If I hadn't of gotten my setup for free I wouldn't have spent the 300 on it.
 

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I made my own and i notice a bit of change.. maybe 40-50 bucks for EVERYTHING.. It pulls hard in the highs and was preatty much same in the lows. If you have driven a small 1.5-2L 4 banger that revs high you can feel how the power goes up at like 4-5k rpm .. preatty similar. I'm getting couple of miles (2ish) better on my mpg if i drive it nicely but its hard because of the whistling sound it makes and it sounds nicer when floored like you can hear each ?puff/pop? going into the exhaust manifold.

check out page 2 in my cardomain for pics and soundclip
 

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If you are building a Jeep for the dragstrip, then yeah a cold air intake is worth it. But for trail use and 99.99% of those who drive on the street, the gains are just not there and it's not worth the $$$.
 

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with the gas prices being +3 a gallon.. it makes up for it eventually.. before i used to go 180 before the light turns on now i go 195ish-200 on a full tank.. thats 20ish miles better with the same amount of fuel and you get the hype of the sound it makes :D
 

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with the gas prices being +3 a gallon.. it makes up for it eventually.. before i used to go 180 before the light turns on now i go 195ish-200 on a full tank.. thats 20ish miles better with the same amount of fuel and you get the hype of the sound it makes :D
That's simply the placebo effect in action. Cooler air is denser air so more fuel is injected to bring the air-fuel mixture back to the ratio the PCM requires as monitored by the 02 sensor. :)
 

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Extremely Humble
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I have one and wish I'd used the $ 300 elsewhere. If I were to do it all over again I wouldn't have done it.

Hey Jerry wanna race? :D :flipoff: :D
 

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Just did some quick math, and I am only busting your balls so dont get upset(plus I am DEFFINATLY not a mathmatician), im just messin with ya:

Assuming you get 2MPG out of your homeade intake (which is very unlikley) this is what I came up with. Stock MPG say 15, so with intake 17. You said you get 200miles out of your tank, so it takes 13.3 gallons stock, and 11.7 gallons with your intake, to get 200 miles. At 3 bucks a gallon, your talking 39.9(40) bucks to fill up stock, and 35 with your intake. A 5 dollar difference every fill up, with a $300 dollar aftermarket intake, it will take you 12,000 miles to BREAK EVEN.

with that said, i wouldnt buy or make your own intake based on gas mileage, and wouldnt dont do it for power increase since no one has been able to prove the 4.0s benifit from it. Just my .02.
 

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300/5 = 60.... it would take 60 fill ups to break even. but you're also missing 2 important things from the equation. is 200miles per tank (mpt) the stock intake or on the modified intake. also what is the mpt with the other setup
 

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with a $300 dollar aftermarket intake, it will take you 12,000 miles to BREAK EVEN
I'm with you on this one i wouldnt spend 300 on intake.. i wouldnt spend even 200 on it.. 50 seems like an ok bill to waste lol:D I'm currently boring the underneath of my throttle body to 60mm also since it was smaller than the gasket and the intake manifold hole :confused:
 

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if you want better performance than a better muffler and less restrictive pipes are the way to go, even if it can get more air in it cant push it out. It will also sound a lot better.

Either way though if you want a high performance car sell your jeep!
 

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I just finished re-installing my bored throttle body.. i'm loving it ..it whisles more now :D and it is so crispy :) didnt do a power test yet lol.. it also got a bit more rev frendlier. I cleaned the throttle body at the same time and it idles better too
 
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