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Coyotekart63 said:
My CAI I made myself works just fine. More power above 4500RPM and louder too. Between that and the cat gut I went from 300 miles per tank to 360 miles per tank.
Gutting out the cat makes a good difference in most applications. Although, it does hurt the environment and can violate the rules. I would recommend buying a high-flow cat instead. High-flow cats have a larger ID (inside diameter) at the flanges, and often have less restrictive internals. In some instances, a high-flow cat is better than a gutted cat because the larger ID.
 

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A larger inside diameter? You forgot to mention the phrase "WITH RESTRICTION". You're simply generalizing your statements to make them apply to the situation. How much you truly know about what you're saying, is beyond me. Gutting your cat > high-flow cat, larger inside diameter or not. In fact, go ahead and buy a TBS while you're at it. They're great for most applications! Wait, nevermind. :roll:
 

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A nonrestritive Cold Air Intake will help your fuel mileage. I have a Home Made Cold Air Intake on my truck. My truck is a 2008 4x4 Crew Cab Z71 with the I5 3.7 engine. I have a Cold Air Intake for sale that I made for another guy, but he did not come and get it. I have priced it at $75.00 due to the labor time and materials that I have put into it. If interested in seeing it I have it posted on the 355 Web site. I will see if I can post a picture here. Let me know if you are interested. The one that I made is for a 2004 and 2005 Colorado. But it will work on any model. If you don't need the front air fitting you just cap it off. Let me see if I can put a picture on here.
 

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^ Cool. Nice intake. I think that is considered a 'short-ram' intake. Unless the air filter sits inside the stock cold air box or something. It peeves me when people mix up the different intake types: cold air intake, short-ram intake, long-ram intake. I'm not a fan of PVC in cars tho. I won't say anything else about it since you are trying to sell.

In any event, it looks better than a stock intake. Still not exactly the same as cold air tho.
 

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The above Intake does hookup to the Stock Airbox and I have a K&N filter in the Airbox. This is not a ram since it does pull air from the Stock Airbox. This just lets the air flow smooth into the Throttle Body. It does increase air flow into the throttle body. The PVC is a Schedule 40 and I have run this unit for 6 months without any problems. The PVC does not transfer heat like metal will do. I stand behind my unit.
 

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I don't see a picture of this installed, but I see two solid couplings. If this is installed without a slip joint or an accordian type coupling on the engine side, it will transmit the engine movements and vibrations to the filter end. If the filter end is fixed, this will eventually be destroyed.

What I would really like to see here is someone install a manifold pressure (A.K.A. vacuum) gage at the throttle end of the OEM device, and another at the air filter end (outside the filter). Then take measurements at part throttle and full throttle to see if there is a measuable drop in pressure from one end to the other. Then install the PVC device and take the same measurements. If there is a documented improvement at part throttle, then all that is left to be done is explain how this causes a rich mixture with the OEM device. If there is an improvement in manifold pressure at the throttle inlet at full throttle, then I will agree there is going to be a HP increase.
 

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Wildbill,

The couplings are not rigid. They are made out of a heavy duty rubber. They do give movement to the motor and to the air box. I will attached a picture of the one that is on my truck.

 
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i've installed a custom CAI on my colly as well. i used all pvc from lowes and it might have cost me 30$ for all of it. for me, i track my mileage on every fill up and i gained 4 mpg city and 7 hwy and i drive extremely "spirited". that is stats from about 8 months of tracking. i did nothing else to it for that timeframe. what i did was replaced the tubing from the box to the throttle body and my pipe picks up just behind the tow hook, although i just added an end on it and bolted it to the bottom of the valance so it stays in place better and picks up air unrestricted by anything.

i wouldn't buy a kit...ever. way too expensive and you can do the same thing, that looks good, for a small fraction of the price.

as for the oem setup, mine had a small tube that came molded into the box, which i have blocked off for my setup, that picked up inside the right quarter panel next to the box itself. i couldn't imagine it picking up any cold air from that spot as it would have to go past the radiator, headlights and anything else in between. i can't say for sure as i don't have an intake air temp gauge but its pretty obvious that it would be much warmer then my setup.

now, how a cai system would produce better milage. the cooler the air coming in, the more compact the air molecules and the more that can fit in. since it has more air molecules, it mixes with the fuel spray inside the head better and thus produces a better combustion inside the head, resulting in a better use of the fuel put into the head. this results in less fuel needed to run the engine, this is adjusted by the on board computer by sensing the air temp and putting in less fuel to the cylinder to cause the combustion.

additionally, the manufacturer does not include some of these items as it usually results in a louder engine. something the "average" consumer doesn't want. adding some of these systems would also add a lot to the price of the vehicle as it adds complexity to the manufacture process of the vehicle.
 

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HipCat,

I would like to see pictures of your system if you have them and can post them. I am sure your system is good and you like it very much. I like my, but would like to improve the air flow from the air box by getting more air into the air box. It sounds like your system could be my answer to the way I want my to be. Thanks
 

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So.If i hog out the baffling in the stock unit and put in a K&N filter,I should have virtually the same thing and can increase my gas mileage and power?
 

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RMCBRIDE said:
Harley80,

If you will fix it where the air flow to the throttle body is smooth and and lots of it, you will have better performance.
This is true. You're supposed to have all the intake air pipe the same size. ;) :wink:
 
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i did use all the same size actually ; )

here are the pics (lots):














the upper part coming from the box has one of the rubber couplings on it so that i can easily remove the tube if need be as well as flex easily. the straight part of the tube and the angle at the bottom are glued together for strength. then, the last bit of tube that is connected to the valance has another rubber coupling attached so that can easily be removed as well and flex for movement also. i need to reseal the tube into the box right now as the sealant is coming off. i'll likely use gorilla glue this time.
 
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yeah, i put it on about 3 years ago and just never took it off. i don't even think i have the original throttle body bolts anymore to change it out even if i felt like it :lol:
 
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no problem, if you have any questions just pm me. i usually check the boards once every couple days.
 

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I assume y'all know this thread was posted in 2009.
 
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