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Old 04-28-2005, 08:22 PM   #1
sanovichleo
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Have a Nice Day? Differences in Intakes for 2000 2.5RS

What are the differences between AEM, Injen, COBB, Ganzflow, K&N, Weapon-R etc.... CAI's? I've read all the posts and have yet to find a clear explanation as to why most Subaru owners like COBB and Ganzflow more than the more marketable companies like AEM, Injen and K&N. What is the main difference between all of these intakes? Also, I've seen some people attach their CAI to the stock airbox while some have taken the airbox off completely and attached the CAI straight to the throttle body, what is the difference between these two setups?
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Old 04-28-2005, 10:00 PM   #2
sebtarta
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Well, I have a ganzflow installed and I must say, the engine breaths better. I had an AEM installed, where it replaces the air box, and my car was kinda sleepy in low revs. In high revs the engine was alive that yes. Fuel economy went out the roof, the car decided to drink fuel as there was no tomorrow. SO went back to stock, sold the AEM SRI.

Kept looking, asking questions. People said that the cobb is a good CAI but for the $$$ its a bit high.

Then I found out that by having the ganzflow, as it keeps the box, your low end torque increases. This is because the engine has that air that it needs in the box. Also it allows the engine to be a bit leaner, ie. less fuel consumption.

After that and all, I managed to get 360 miles per tank, with the ganzfow, borla headers. This is by normal driving, shifting at 3000rpm and cruising at 70mph on the highway. It took a lot of effort, specially for a full week, but i managed to test how much i could do.

So, my 2 cents basically you can go flat out spend $$$ on the Cobb CAI, or a mare $110 for the ganzflow, drop a K&N filter and off you go. Or even go to autozone and get for $50 a air intake for the coffee cans cars *cough "Honda" cough*. Which i found out once i got the ganz.

Good luck,

Oh, weapon R etc.. ..nuff said.
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Old 04-28-2005, 10:02 PM   #3
cabe
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Quality and appearance. Some of the intakes like Weapon R, for example, are just genero-intakes made for every car (they look ricey too, LOL I had one). Others are really expensive (Injen). I'd get Cobb, everyone seems to like them. Don't go too cheap, you want it to look good and not mess up your maf (or map?) but don't go too expensive, it's just a pipe
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Old 04-28-2005, 10:28 PM   #4
sanovichleo
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I think Im a little lost when it comes to Cobb and Ganzflow, do they sell just the pipe? or does it also include the actual filter as well? Is it $110 for the Ganzflow with the K&N filter or is that the price for just the pipe?
P.S. If I get a CAI and put it into the fender, does the size of the filter make it more difficult to install, it seems as though theres not gonna be too much room to put an oval filter in the fender well.
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Old 04-29-2005, 07:51 AM   #5
sebtarta
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Well the cobb CAI has the filter in the middle, while the ganzflow keep the OEM or any other aftermarket filter in the box. Both come out from the fender well.
As mentioned before it just a 3" diameter pipe. You can get these for cheap.....
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Old 04-29-2005, 10:11 AM   #6
DreddRS25
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And if you are interested in a Ganzflow, just buy it used.

If it isn't too scratched or marked, then you spend less than half the price quoted above.
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Old 04-29-2005, 12:18 PM   #7
sanovichleo
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So if I were to get a ganzflow, it would just be the pipe, for $110 (new)? The K&N filter that some talk about is just the rectangular one that goes into the stock airbox right? I'm just considering whether I should go with that Ganzflow or just go to home depot and try to do the pipe myself. If im picturing this correctly the pipe just goes into the fender well and there's nothing attached to it at the end, just an opening in the pipe, am I seeing it right?
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Old 04-29-2005, 01:16 PM   #8
DreddRS25
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Quote:
Originally Posted by sanovichleo
So if I were to get a ganzflow, it would just be the pipe, for $110 (new)? The K&N filter that some talk about is just the rectangular one that goes into the stock airbox right? I'm just considering whether I should go with that Ganzflow or just go to home depot and try to do the pipe myself. If im picturing this correctly the pipe just goes into the fender well and there's nothing attached to it at the end, just an opening in the pipe, am I seeing it right?
You could basically do the same thing using plumbing pipes for the intake. I did that before I bought a Ganzflow. It really seemed to only change the sound a bit. When I put on the ganzflow, I could tell that the air was moving more smoothly and pickup was a little faster on the top end. Also I only used 2" piping, and I believe the Ganzflow is closer to 2.5-3".

If you want I could take a pic with all the pieces I have left of my DIY intake so that you can get an idea of how to design it.

The Ganzflow new is close to $100-110 and the K&N will run an extra $40-45. I bought my Ganflow used and it looked brand new. There is usually one floating around for sale.
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Old 04-29-2005, 02:27 PM   #9
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You can also get a PDM Racing CAI for $50, which is identical to the gen.1 GanzFlow. The Ganz is now shaped differently, but both are filter-less CAIs that utilize the OE airbox.
http://www.pdm-racing.com/products/subaru_corner.html

Pic:



I'm not sure if they fit a post 2001 Impreza, though....


I have one in my '00. Not sure why the stickers are upside-down on that particular pic, but they came right-side-up on mine. Also notice that the owner of the car in the pic is using a forward-facing (a "reverse") strut brace, which is good for intercooler clearance. Useless on an N/A Impreza. (I have a regular, rear-facing Whiteline.)

=S2=
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Old 04-29-2005, 05:05 PM   #10
sanovichleo
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Also, what is this MAF sensor? what does it do and how do I connect it to the intake if I were to buy a PDM or ganzflow or if I were to build my own?
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Old 04-30-2005, 12:44 AM   #11
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The real key to making the Ganzflow work is the 3" nipple into the airbox. The Ganz comes with a 3"x2.5" coupling so it will mate with the factory elbow into the airbox. The factory elbow, being 2.5" O.D., with .125" wall thickness, is only 2-1/4" I.D., total bottleneck. If you look around on Imprezars.com, look for the "factory air-box mod" It shows you how to put a 3" nipple, so you have 3" all the way into the air-box, and still keep ALL of your low-end torque.

I made my own, I bought some 3" O.D., x .065" (so, techically it's 2-7/8" I.D.)wall aluminum tubing, bought some 3" turbo induction elbows from the local diesel supply, the elbows cost me $7.50 each, my whole intake cost me about $20. Looks good, performs great.

The 3" nipple is the key. Even before I put the pipe into the fender, it pulled SO much harder, throughout the powerband. I swear I didn't lose anything anywhere.
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Old 04-30-2005, 12:46 AM   #12
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Quote:
Originally Posted by sanovichleo
Also, what is this MAF sensor? what does it do and how do I connect it to the intake if I were to buy a PDM or ganzflow or if I were to build my own?
You won't have to do anything with it. The '99 and earlier were the ones that had issues with these, ours are different.
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Old 04-30-2005, 03:41 AM   #13
Seeing StaRS
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The PDM racing pipe fits a 2001 Siper. I put one on my girl's car

I would be torn between the PDM and the Cobb. I like my Cobb but at the same rate my girls PDM intake is pretty nice too. To the person looking for an intake I would look for either of these two intakes USED. That will save you some considerable loot

joe
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Old 05-03-2005, 09:49 PM   #14
sanovichleo
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Will I still be able to get that cool intake sound if I keep my stock airbox but replace the filter itself with some sort of better one (K&N)?
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Old 05-03-2005, 10:08 PM   #15
deuce.five
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Quote:
Originally Posted by sanovichleo
Will I still be able to get that cool intake sound if I keep my stock airbox but replace the filter itself with some sort of better one (K&N)?
My "homemade" Ganzflow sounds very nice, it pulls so much air you cannot help but hear it, but it's not obnoxious either. Nice low growl from the engine bay.
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Old 05-03-2005, 10:52 PM   #16
Tim Sanderson
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Quote:
Originally Posted by deuce.five
My "homemade" Ganzflow sounds very nice, it pulls so much air you cannot help but hear it, but it's not obnoxious either. Nice low growl from the engine bay.
Speaking of growl, have you tried removing the piping and leaving the box? I thought it sounded pretty cool. Too bad I was sucking in all that warm air. Shame on me.
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Old 05-03-2005, 10:54 PM   #17
Bobert540
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i have been looking for a used cobb for awhile and haven't found any.....anyone know where else to look for them besides this forum?? thanks
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Old 05-03-2005, 10:54 PM   #18
Bobert540
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also, how does the pdm perform compared to the cobb?
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Old 05-04-2005, 08:31 AM   #19
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Quote:
Originally Posted by Seeing StaRS
The PDM racing pipe fits a 2001 Siper. I put one on my girl's car


joe
Yeah but I said "post 2001."
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Old 05-05-2005, 08:53 PM   #20
sanovichleo
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I went to Lowe's today and picked up some PVC piping. Does anyone know what degree the angle should be if I keep the stock airbox and simply attach a quick short bending pipe to it (then the actual straight pipe connecting to that)? and yea, it is kinda hard to find perfect matching size pipes, I got one 45degree angle pipe and after I attached that to the airbox and the other pipe to it, it ended up missing its target and it was around the area of the sealed fender hole (the one closer to the front of the car). That's why I was aking about the angle of the pipe
thanks
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Old 05-06-2005, 09:27 AM   #21
DreddRS25
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Quote:
Originally Posted by sanovichleo
I went to Lowe's today and picked up some PVC piping. Does anyone know what degree the angle should be if I keep the stock airbox and simply attach a quick short bending pipe to it (then the actual straight pipe connecting to that)? and yea, it is kinda hard to find perfect matching size pipes, I got one 45degree angle pipe and after I attached that to the airbox and the other pipe to it, it ended up missing its target and it was around the area of the sealed fender hole (the one closer to the front of the car). That's why I was aking about the angle of the pipe
thanks
Long over do. Ganzflow vs. DIY. I used 2"to3" coupler, 45 degree elbow (Male+Female ends), and 2" PVC pipe (smaller than you'll need). Everything lined up real nice, hardest part was cutting the pipe to the correct length.

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Old 05-06-2005, 09:30 AM   #22
mc mcdougal
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OMGHi2U

BUY THE COBB CIA. I have tried multiple different models and I have never recieved the response I did when I installed the Cobb CIA. The cobb cia replaces all stock components and hides the filter from the engine bays hotter air. Also, since the filter is hidden inside the tube and the pipe reaches all the way into the side fender, you can ensure you are pulling air from outside of the engine bay. Install is a near perfect fit also. Sound is awsome. Price is a biotch.
The problem with the ganz flow is that if you are trying to relieve the restriction on your engine's air flow, this cia will only 1/2 fix the problem. This cia replaces only 1 of the two filters in the stock cia, so you are left with the restriction from the remaining filter. True you have a filter in the Cobb intake, but it will flow better than the stock one.
Lowes piping trick: Good b/c it is cheap. But I say drop the cash.
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Old 05-06-2005, 09:39 AM   #23
DreddRS25
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Quote:
Originally Posted by mc mcdougal
BUY THE COBB CIA.
Totally agree. But justifying $250 on an intake is a tough decision for most.


Quote:
Originally Posted by mc mcdougal
The problem with the ganz flow is that if you are trying to relieve the restriction on your engine's air flow, this cia will only 1/2 fix the problem. This cia replaces only 1 of the two filters in the stock cia, so you are left with the restriction from the remaining filter.
IIRC, for the 2000 Imprezas there is only one filter at the TB. The rest is just a bunch of plastic piping.
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Old 05-06-2005, 10:38 AM   #24
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My bad. good call.
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Old 05-06-2005, 06:30 PM   #25
sanovichleo
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I found a good size rubber coupler that fit and I put it all together for about $20. BTW, what type of material goes around the hole? is it just some foam or something? and should I cover the actual PVC pipe with some sort of material to keep it cool?
thanks
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