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Old 05-11-2006, 11:30 PM   #1
Rockgod
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Default Cold Air Induction questions from a noob

I'd like to know if anyone can tell me what should use to give my 2001 Legacy cold air for more horsepower? Any answers are appreciated.
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Old 05-12-2006, 07:53 AM   #2
MYfirst00
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Don't bother. Just get a K&N drop-in panel filter and save your money. Your getting cold air with the stock airbox. Just make it flow better.
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Old 05-12-2006, 10:41 AM   #3
fibuz
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Quote:
Originally Posted by MYfirst00
Don't bother. Just get a K&N drop-in panel filter and save your money. Your getting cold air with the stock airbox. Just make it flow better.
+1 pretty much unless you're looking for a cool sound intake. performance wise, you're not gonna squeek much HP out of an intake.

fibuz
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Old 05-12-2006, 10:57 AM   #4
Plays_With_toys
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Get a good paper filter and, if you want you can get an exhaust shop to bend up some piping. That's what HFS Devil did on his BE. Here's a link:

http://www.sl-i.net/FORUM/viewtopic.php?t=852&start=0
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Old 05-12-2006, 11:38 AM   #5
bhall
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You are not going to see any real HP gains with the typical bolt ons with this car or at least the money spent to HP gained is going to be way off. I know it sucks but you are best to just accept it and spend your money in the handling department. For the price of a Cobb CAI you can get a set of springs or a nice sway bar and get far more out of your money.

Now if you just want to make a bit more noise, which is fine if thats what your in to, you can get the Cobb setup but it is pricey or do what PWT said and get a drop in and bend a pipe to the fender.

A number of us have messed with this for a couple years and it always seems to come back to the factory setup is not that bad with maybe the addition of a drop in K&N.

good luck!
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Old 05-12-2006, 06:35 PM   #6
Rockgod
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Thanks Guys, I indeed wanted more HP and a better sound note. ordered my K&N filter today. now here's another question or two.

If I wanted more sound coming out of the car, which setup is better concerning the air panel box? In other words, based on what I read (thanks for the link, P.W.T).

Should I place the pipe into the body? or should I just leave it alone and place the pipe the way the link demostrated in the photos?
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Old 05-12-2006, 07:40 PM   #7
spdracr00
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dont bother with a CAI... if anything get a shortram.. cai's are better for turbo's where cooler air makes a difference. i do like the sound of my GP-Moto intake. and i did gain 1mpg.. but i think thats mostly due to leaning out the mixture a little. no real power gains at all.
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Old 05-12-2006, 08:07 PM   #8
IronMonkeyL255
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The Injen setup is pretty sweet.

My uncle just put one on his 2001 Legacy wagon and it made quite a difference. in low revs it sounds a bit louder, but not obtrusively so. In high revs, it has a very nice, distinctive boxer howl.
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Old 05-13-2006, 01:59 AM   #9
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Read this test before you buy a K&N http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
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Old 05-13-2006, 02:35 AM   #10
Kraziken
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I think with the cold air intakes, you'll find it appears to have more power in the upper RPM range (where the N/A motors appear to be pretty flat).

But you also lose a bit of the low end torque.
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Old 05-14-2006, 11:17 PM   #11
bhall
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Quote:
Originally Posted by spdracr00
dont bother with a CAI... if anything get a shortram.. cai's are better for turbo's where cooler air makes a difference. i do like the sound of my GP-Moto intake. and i did gain 1mpg.. but i think thats mostly due to leaning out the mixture a little. no real power gains at all.
This is not from first hand experience but I have heard since the short ram sits right on top of the headers you can end up having some issues with sucking up hot air at higher RPM's, just fyi.
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Old 05-15-2006, 03:04 AM   #12
that one legacy
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on my BG, all i did for cold air was remove the baffle inside the fender, and route a piece of flex tubing down into the front bumper. the pipe then attaches to an air funnel, which sits right behind the fog light in the bumper opening.

with your BE though, you do have that large funnel that draws air directly in from the grill, so yeah you already have a fairly effective CAI. just get that K&N filter like everyone else mentioned (i've got one too), and you'll do fine. i was actually considering trying to pick up the factory funnel from a BE and trying to adapt it to the intake system on my car, because the design looks pretty sound.
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Old 05-15-2006, 07:18 AM   #13
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Default anyone?

Has anyone tried using the hood scoop as a CAI? . . it would require a lot of time it looks liek to make it work nicely, not to mention if it rains and such. Just wondered.
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Old 05-15-2006, 08:01 AM   #14
Wiscon_Mark
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Quote:
Originally Posted by vitai0
Has anyone tried using the hood scoop as a CAI? . . it would require a lot of time it looks liek to make it work nicely, not to mention if it rains and such. Just wondered.
It's easy enough on the BEs since the box is right underneath the scoop. You just have to get a Baja hood to have that scoop.

It'd be a bit more tricky with BD/BG/BKs because of the MAF placement.
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Old 05-15-2006, 03:50 PM   #15
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Read this thread first:

http://forums.nasioc.com/forums/showthread.php?t=345720

I have a Cobb CAI and it's the one mod that did the most to my car, seriously. It's pleasing to the ears at low throttle, aggressive at mid, and wailing at WOT. It looks good, works good and you get what you pay for.
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Old 05-15-2006, 10:43 PM   #16
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I've heard the best things about the cobb and the weapon R intakes.

Cobb is probably the best because it's very subaru specific.
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Old 05-15-2006, 10:48 PM   #17
spdracr00
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I have the K&N on my 02 wrx and the GP-Moto on my legacy.. I like them both.. and no cels...
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Old 05-16-2006, 03:04 PM   #18
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Back in the day, dyno testing on the 98-99 Impreza 2.5RS showed up to 15whp increase from aftermarket intakes. Stock was putting down around 100whp and with just an intake they were getting up to 115whp. This was from Sports Car Compact I believe. Although screwing with the MAF/MAP can lead to other problems.
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Old 05-16-2006, 04:45 PM   #19
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K&N panels are a waste of money, you will see nothing on a dyno with a panel filter swap. If you want some colder air simply add a pipe from your airbaox (stock with stock filter) to the fender well. You will notice a little more top end and may see 1-3WHP on the dyno. COBB, for way more money will get you a little more to the wheels and sounds louder. Other than that every other intake I have seen does very little. Don't get anything that ends in the engine bay.
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Old 05-16-2006, 06:25 PM   #20
Wiscon_Mark
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I'm still liking the ram air idea. Once this rain lets up (it's been going for a week and a half!) I'm going to take the fogs out and reinstall my 28.26 sq. inch air catcher

Last edited by Wiscon_Mark; 05-17-2006 at 06:02 PM.
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Old 05-17-2006, 03:02 PM   #21
Plays_With_toys
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Quote:
Originally Posted by Wiscon_Mark
I'm still liking the ram air idea. Once this rain lets up (it's been going for a week and a half!) I'm going to take the fogs out and reinstall my 9.4247 sq. inch air catcher
If you unplug the fog lights there, air also will circulate up past your passenger side headlight into the engine bay, as there is a quite a large hole there. BTW, I just looked at my manufacturing stamp, and although my car is a 1996 labeled legacy, it was manufactured in july of 95, so we have the same car Mark.
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Old 05-17-2006, 06:01 PM   #22
Wiscon_Mark
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Well, yes, our car are extremely similar, but mine was made (and bought) in September of 94

edit: screwed up my math. Area is Pi x r^2, not Pi x r (so 28 sq. in)
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Old 05-17-2006, 08:22 PM   #23
iamrazor
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not to be rude, but:

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Old 05-17-2006, 08:33 PM   #24
Wiscon_Mark
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It's whoosh's birthday on that .gif
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Old 05-17-2006, 08:36 PM   #25
janikphoto
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i think my lightened flywheel has been money well spent. The car seems more responsive and a bit quicker. I've played with air intake mods, but the only thing it seemed to do was make the engine sound better...
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