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Topic Review (Newest First)
Today 11:54 AM
Jerry Bransford The intake's trumpet, as it's called, may seem restrictive but it easily flows more CFM than the engine can draw at redline and WOT. Its opening was purposely made that diameter to speed up the air velocity for more thorough combustion and a quieter air intake. That it's restrictive is a common misconception until researched more thoroughly.

But you can easily remove the trumpet with a quarter turn if you really think it's restrictive and causing you to lose street races.
Today 11:43 AM
Aarce65
Quote:
Originally Posted by Jerry Bransford View Post
The TJ's air intake is completely free breathing with no restrictions like some engines have. So when the factory OE air intake system is already capable of delivering more air than the engine can consume, offering it more air won't make a difference.

Installing an aftermarket air intake onto a 4.0L engine is, in my personal opinion, like inserting a big funnel into your mouth in the belief you'll be able to breathe more air in and thus be able to run faster.


The factory system is restrictive due to the air box intake snorkel having a smaller inlet diameter than the throttle body has
08-17-2014 09:36 AM
BirminghamTJ
Quote:
Originally Posted by Twiztids4 View Post
Check your connections and retighten as necessary. Anytime I put an intake on anything I snug down all the Philips screws (should also be like a 5/16" socket). After a few drives with the heating and cooling you can snug them down a bit more and that should get rid of the whistle. I put intake on my jeep and love it. Now it pulls cool air and also raises where it's getting the air from. Lastly it gave me room To put that storage box in which is awesome because now i keep all the recovery equipment in there. I usually run with the doors off and that used to be an expensive gamble to keep all the snatch blocks, tow straps, d rings and tree savers in the cab.
I think I've found it. The problem wasn't with the cold air intake at all. Pulled off the intake and tb and tracked the noise with an electric stetho. It's a leaky manifold seal. Im pulling it apart after work today for a new gasket and some copper coat. Thanks for the ideas on fixing her!
08-15-2014 09:21 AM
Twiztids4 Check your connections and retighten as necessary. Anytime I put an intake on anything I snug down all the Philips screws (should also be like a 5/16" socket). After a few drives with the heating and cooling you can snug them down a bit more and that should get rid of the whistle. I put intake on my jeep and love it. Now it pulls cool air and also raises where it's getting the air from. Lastly it gave me room To put that storage box in which is awesome because now i keep all the recovery equipment in there. I usually run with the doors off and that used to be an expensive gamble to keep all the snatch blocks, tow straps, d rings and tree savers in the cab.
08-15-2014 06:56 AM
BirminghamTJ I have this intake as well... For justified reasons, although I dislike the shiny smudge magnet under my hood.

Mine whistles... Not a light whistle but an extremely loud almost bad pully bearing whistle. A slightly higher pitch though. Dear god its annoying.

Has anyone dealt with this issue? I can deal with, and actually enjoy the slight whistle when in that 1500-1600rpm range but lately mine is whistling any time there isn't a load on the engine. Idle - 3000 rpm.

I'd love to keep and justify this intake but I need a solution to this issue first. Otherwise it's being sold or crushed. Haha
07-27-2014 06:32 PM
yachtdr22
Quote:
Originally Posted by Jerry Bransford View Post
You ever try to pick up a tool out of a toolbox that is usually right at 210 degrees or close to it?
yuppers.... any tool in the crossover box of a pick up in TEXAS!
Gloves !
07-26-2014 01:01 AM
krisbman
Quote:
Originally Posted by Jerry Bransford View Post
You ever try to pick up a tool out of a toolbox that is usually right at 210 degrees or close to it?
I did. Left my GP dolly out in the sun once. Big mistake
07-26-2014 12:00 AM
Jerry Bransford
Quote:
Originally Posted by Twiztids4 View Post
I was considering this intake not for the gains but for the extra storage space. They have a box that goes in the place of the airbox that you can put stuff in. Not really sure if it would be big enough to stow anything useful in. Just looking for some decent options for extra gear since I usually have the gf in the other seat and the dog in the back (don't need everything rolling around nor do I have a lot of room with the dog in the back). Here is a link to what I'm talking about.
You ever try to pick up a tool out of a toolbox that is usually right at 210 degrees or close to it?
07-25-2014 09:35 PM
Majnoon Wow. That's a big azz box! I like it. Hey performance gains will not exist but damn that box is nice. Could fit lots in that.
07-25-2014 09:28 PM
Twiztids4 I was considering this intake not for the gains but for the extra storage space. They have a box that goes in the place of the airbox that you can put stuff in. Not really sure if it would be big enough to stow anything useful in. Just looking for some decent options for extra gear since I usually have the gf in the other seat and the dog in the back (don't need everything rolling around nor do I have a lot of room with the dog in the back). Here is a link to what I'm talking about. Are there any other decent options? I was also looking into the molle attachments that bolt into the tailgate but my rear hatch leaks slightly with a lot of rain so it any gear could potentially get wet.
Spectre Performance 99431 Storage Box | eBay
07-25-2014 01:05 PM
jeepermcclure11 Yeah it will! Its the same O.D. on the throttle body
07-25-2014 12:15 PM
jeepermcclure11 Spectre is a good option if you get the river raider cowl snorkel!! It adds a filter to that snorkel and if you dont like the look of the Traditional snorkel river raider is sweet
10-23-2011 07:29 PM
2JeepsThatRun Does any one know if this would fit on a 2.5l with a 4.0s throttle body?
09-02-2011 10:43 AM
IslandTJ Meh, IMO the only reason to replace a Jeep's stock airbox is to make space for OBA. Anything else, is time and money expended.
09-02-2011 10:24 AM
jgorm
Quote:
Originally Posted by Six Gun Matt View Post
Before and after Dyno tests showed 11 hp gain over stock, which is noticeable. T
That is BS. I have the sepctre intake and I did 18 dyno pulls with different tests during the intake install. There are no statistical gains. It runs pretty loud. Cold starts are the worst and you can really hear it sucking air. The sound bounces off the roof of my garage. At WOT it sounds bad ass, not too loud, but enough that it sounds cool. My reasons for doing this intake are as follows.
1. make room for a fender lift.
2. too lazy to find junk yard parts that fit.
3. another reason to play with the dyno and verify, or call BS on their claims.
4. To get fresh cowl cold air.

#4 is the best reason for a cowl intake. My IATs dropped substantially and run about 10* over ambient. This will cause a gain in hp under certain conditions that would be difficult or impossible to measure on the dyno. It really lowers the IATs while going slow offroading. I have seen IATs of 175F while the stock intake is sucking that nice fresh air off the back of the radiator.

I'm going to install a 90* elbow inside the cowl to cut down on the sound, and install one of the cab filter cowl scoop things (maybe 2 of them). Then I'll have a double filter, and the in-cab HVAC will be filtered as well.

Here is my testing data.
Jeep Wrangler 18 dyno pulls for CAI testing - Trick Tuners Forums
09-01-2011 03:51 PM
Beowulf Here where you can pick up the mushroom snorkel head.

Tisco Tractor Part Mart: Reliable Tractor Parts You Need. Fast :: PRECLEANER (C5NN9A660A)


Matt Savage Land Rover Parts Raised Air Intakes
04-11-2011 09:11 PM
Hawk Driver
Spectre CAI

I bought an 04 TJ Unlim. which had one already installed. I owned a '00 sport before this. Same engine. I DO notice a difference between the acceleration of this jeep vs my other. What I'm looking for now is a way to snorkel this sucker so that I don't have to keep cleaning my air filter every time I get muddy. Something to think about though is IF it does introduce cooler air, this will definately help over the life of the engine. You add a louvered hood and you may extend the life of your engine for many miles.
03-25-2011 11:27 PM
99TJCrawler I have one of these. It will not get you better mileage.
03-25-2011 10:38 PM
s3nt3nc3d What mixture? Our engines are fuel injected, not carbureted. The intake only allows air into the system...the air and fuel aren't mixed until they enter the cylinders. A cold-air intake on our engines will have no significant effects on fuel economy.
03-25-2011 09:45 PM
eric_b993 Does anyone know what this does for mileage? It should increase efficiency by making the mixture burn better, but does it?
01-29-2011 11:13 PM
99TJCrawler Just installed it yesterday. I don't feel a real difference to be honest. I didn't expect a lot out of it. The throttle response seems a little snappier. The biggest benefit for me, as I stated earlier, was gaining the space where the intake box used to be. Right now, I'm working on how to turn this into a snorkel. Shouldn't be too difficult to do. Just so you know, the hole you need to drill in the firewall IS NOT in the dead center. Make sure to read the instructions. I did not read them but fortunately, I made the hole on the passenger side anyways lol. That could have been really bad. Like I said, instructions are your friend. Overall, the install was very simple. It makes it easier if you take off the hood also. Anyone know where I can get a snorkel head from w/o having to buy the kit?
01-27-2011 05:57 PM
sandro thanks six gun matt, and 99 tj crawler, i was guessing to use black silicone, please get back to us and let us know how you like it, does it make noise, etc.
thanks again, i live vicariously through you until i can do this to mine. (still at engine shop in pieces) week 4 now
01-27-2011 05:52 PM
99TJCrawler Holy crap! That is awesome! Your going to put a freaking welder where the air box was?! Your like a mad scientist or something! Now I want a damn welder on my car! Make sure to post those pics!
01-27-2011 01:53 PM
acrijos I am using the spectre as the basis for home built hummer type snorkel. I cannot install a "normal" snorkel as the ARB as I have a Premier Power Welder in the place where the OEM airbox used to be. As soon as I finish, I will post pictures.
01-27-2011 12:32 PM
99TJCrawler Btw, drilling the hole isn't that big of a deal. Just make sure the hole is the size of the tubing, (3") and use black silicone gasket maker to make a seal on it. The tubing does not go into the passenger compartment and you will not be drilling into the passenger compartment so it will not cause problems.
01-27-2011 12:28 PM
99TJCrawler I am installing it sometime this week so I will give you some feedback on it.
01-27-2011 10:01 AM
Six Gun Matt Spectre actually installed one on my TJ, as noted above. Yes, it does make a whistling noise at certain points related to RPMs, speed, and throttle position. It's not really a constant loud whistling, but there is a very slight constant hissing. It doesn't bother me at all, I think it sounds kinda cool, but that's just me. It's not like you have to wear ear plugs or anything. In fact my exhaust is far more distracting than the intake. But be prepared for some sort of noise, it's a given.
01-27-2011 08:59 AM
sandro 99TJCrawler, Please tell me, does it make that hissing sound I read about? Is there anything at all as far as throttle response? Anything? I'm very reluctant to cut a hole in my firewall, but this seems like true cold air, vs. the K&N style cone under the hood type? I know my truck runs better on a cold morning, so i was hoping this would help my jeep just a hair? Any input you have is appreciated, thanks
01-26-2011 09:48 PM
99TJCrawler I just bought one of these and I understand where you guys are coming from. The reason that I bought it was 1) as stated previously, it frees up that space where the air box used to be so that I can finally put in my manifold for my on board air, 2) It seems pretty simple to make a snorkel from this kit if you were to run some tubing under the cowl and up the passenger side and if you ever wanted to get rid of it, you could just replace the cowl panel instead of your fender. Little cheaper than buying a snorkel and looks better. If I was suggesting this kit to someone, or any kit for that matter, I would tell them not to expect any horsepower.
01-26-2011 07:34 PM
sandro I like the idea of cold air...i like the idea of a higher intake... i DON'T want anything loud, and i've read that these things can make a hissing sound that is audible from the cabin while driving? Having said that...I'm the guy who would paint a pink stripe on my hood and paste a michael jackson bumper sticker on if it would give me another 10 horse power, so... if anyone has one of these things, please let us know what you think ! Also, I am intrigued about the idea of having a couple of beers and cutting a 3" hole in my firewall with a saws all....that can never be fixed...idk
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