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Discussion Starter #1
While at the local Subaru dealer today, I was talking with one of the parts dept people and he was telling me about Green Air Filters. I haven't heard much about these and was curious if anyone is using one on their Outback? TIA...traintrackker
 

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MY12 WRX, MY07 FXT
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Green, Perrin, K&N, Fram Air Hog, Amsoil...All the same concept--flow air better but not filter better (compared to a paper filter) Oiled gauze, oiled foam, they're all the same pretty much. I have an inline PRM reusable filter in my CAI.

They work great, don't filter as good as paper, and are reusable. I don't recommend getting one if your car is MAF based (older Subaru's) Brian
 

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Discussion Starter #3
Brian, the parts person at the local Subaru dealer had high remarks for the Green filters, which they also sold, and I was curious as to how they ranked compared to K&N...I've got an '01 Outback with the 2.5 and I don't think I've got MAF so eventually, I imagine I'll break down and get one of the replacement panel filters. As for the CAI, I just have a hard time justifying almost $300 for maybe 5-8 hp on a good day...traintrackker
 

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Sure, I understand. However, with a N/A motor 5-8 HP for $300 is a great commodity if that's your last try for HP. But realistically, I made the wife a PVC intake to her stock airbox with a K&N filter and that alone made a difference in her Baja. Brian
 

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Discussion Starter #5
One last item, the parts person at my Subaru dealer said that if I wanted to dump all the air silencing crap off the stock air intake and go with the replacement panel filter, I'd see an improvement. I'm curious if anyone else has attempted to modify the stock set up.
traintrackker
 

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Lord of ScoobyMods, ,
19' Impreza Sport 5 dr / 01' Forester S / 13' OB CVT / 10' Legacy 3.6R / 99 Mita MX-5
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I've been using K&N filters for over 20 years with no problems. I did switch to a Green filter on my F XT. I've found the quality to be very good compared to the K&N. I've used this style of filter on 4 subaru's so far (MAF Based) with no problems. Just do not over oil them. Have a look here:

http://www.scoobymods.com/forums/showthread.php?t=2271

Also search Snorkus (silencer) on our site and you can see how to remove the silencer restriction.
 

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02 OB sport, 2.5, 5MT, WRX seats/catback/rear bar, Hellas, Home Despot CAI and roof rack
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"Oiled gauze, oiled foam, they're all the same pretty much. I have an inline PRM reusable filter in my CAI.

They work great, don't filter as good as paper, and are reusable."

it's the same principle as the old VW oil-bath filters, more or less. i do disagree on the oiled foam; i've used both types on my bikes and the gauze (K&N) type flows lots better than the foam, altho latter prob does trap a bit more dirt.

Brian, any way you could post a foto of your mod on wife's car? been meaning to do the Home Depot plan CAI for a while, and keeping the stock airbox was one of my objectives (i think that assuming equal filter medium, keeping stock airbox will filter out more crud than cone type)(around here, where we get lots of dust storms, just the length of the intake passages will cause a lot of the real estate to fall out of suspension in the air stream...)

bw
 

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cpt, I used 3" PVC pipe (drain,waste...) What I did was extremely easy. Two 45's, less than 12" straight, one rubber 3" to 2.5" connector with the hose clamps already on the ends recessed slightly in grooves. All I did was measure the length between the 45's, dry fit it, find the right angles for the tube to fit into the open fender hole that the stock setup left. The rubber connector could not have fit/worked better, beautiful setup, attatched right to the plastic nozzle piece facing the front of the car.

Stock airbox used still, did not even move it, just took the silencer, and the rest of the plumbing off. Now, I used two 45's that are elbows with one side female and one side male so to speak, in the biz they are called street ells. The male side went into the hole in the fender, coupled with the straight pipe glued right into it, then straight pipe glued right into the other 45's female side, then rubber connector onto the male side of the 45, right onto the black plastic snorkel piece on the air box.

Literally that simple, and I shoud get a pick of it. I painted it black and it did make a difference. The non-mechanical wife can even tell:D . MY03 Baja (Legacy) 2.5 liter. It looks better than anything on the market for stealthness being black, and it fits perfect. I suggest everyone to do it. Cost me $17 in materials including the cleaner/glue. Brian
 

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2001 Wintergreen Outback 5MT
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When I bought my 1988-1/2 Escort it came with a primitive 2-stage air filter, some coarse white plastic weave around a basic paper core. The NAPA replacement part had a foam sleeve around it. I used one filter for many thousands of miles, just washing and oiling the foam once in a while.

OTOH that 3800 in the LeSabre I'm driving now breathes through a filter about the size of a video tape.
 

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bheinz57,
Please please please send a picture of your intake! I just bought a k&n filter and i would love to replace that huge mess of an intake system. But im curious, does the sund level increase by a good margin when you remove all the silencing crap?
 

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I don't have a digital camera, so time will tell on the pics guys. The sound level increased some under a load and 1/2 throttle and more. It sounds good, and it looks good, and it was $$cheap$$. Brian
 

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02 OB sport, 2.5, 5MT, WRX seats/catback/rear bar, Hellas, Home Despot CAI and roof rack
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i don't find the increased sound level from intake noise at all unpleasant or intrusive. as he noted, you really only hear it when you're into the throttle, and it's just a low moan that rises in pitch. be still, my throbbing right foot.... not annoying or droning like exh noise, your S.O. will probably never notice it. and it's not intrusive or usu even noticeable at hwy speeds

me, i'm printing his excellent descrip (i live in a WWII POW camp and much plumbing dates from 40s so i've become intimately familiar with Things Plumbish) and off to Homey after work today. those elbows are called "street elbows" in plumberese, BTW.

bw
 

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Brian,
I have a 2000 OBW. I would think my engine bay would be similar if not exactly the same as you 03 baja. My intake starts at the grill and traces back on the right side of the engine, and ends at the airbox in back of the engine. Does this sound similar to yours?? And if so what did you do with the front part of the plumbing in the grill? TIA
 

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Luke, you can get rid of all the plumbing (plastic pipe) from the grill area to the air filter box. Now, you do have a MAP based engine and not MAF right? This will work for the newer MAP based engines. If you have Mass Air Flow, you will have an inline aluminum piece that measures the air flow coming into your throttle body. Other than that, the intake plumbing should be similar from '00 to '03 I think. Brian
 

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VWectomy for Subie

ooh ooh. i just finished the Scuderia Home Depot CAI plumbing and got the K&N into the stock airbox last night. it now has a lovely but unintrusive snarl when you get into it and revs more freely at all rpm levels. still no mistaking it for an HO engine, but it sounds a lot less like an old VW now. why didn't i do this before?

as a side bft, this seems to help with what i suspect to be an over-rich condition at idle to light throttle; it bogs less when getting it rolling. my gas mileage is gonna suck for a tankful or 2 until i get tired of listening to induction noise and winding the engine up, tho. after that, it'll probably improve a mpg or so.

Luke, i drove it for a few days with just the CAI and the stock filter. i couldn't detect ANY noticeable sound level increase, even under hard acceleration, until i also added the K&N. even now it's not at all intrusive.

now i want to fabricate something to cover the holes into fenderwell and keep the hot air out of that area, and at same time support far end of CAI plumbing. not sure if i'm gonna use 1/4" birch plywood or a section of truck mud flap (1/4 thick cord reinforced rubber). anyone got any suggestions?

nicky louder
 

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bheinz57 said:
Now, you do have a MAP based engine and not MAF right? This will work for the newer MAP based engines. If you have Mass Air Flow, you will have an inline aluminum piece that measures the air flow coming into your throttle body.
Ive heard of a MAF (mass air flow) but what is a MAP engine?? Ill take a pic eventually of my engine and maybe you could tell me.
I figure if i have my intake which scoops are right from the grille it has be be fresh and cool. I noticed the huge hole in the fender where i assume you guys have put the end of your intake, but wouldnt that be more restricive than from the grill??
 

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Manifold absolute pressure...And yours is MAP based a far as I can see, just like my wife's Baja. All that plumbing up to the air box can go, and then build the PVC portion. Just leave the little nipple pointing to the front of the engine on and attatch the rubber coupler there. Brian
 

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Discussion Starter #19
What a maze of plastic...I ditched all the "baffle" plastic and the engine definitely sounds better when you punch it...
traintrackker
 

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What about simply connecting the stock air box to the air intake ram and remove the silencer nonsense? For example connect a PVC 45 to the forward-facing connection on the air filter box (using a rubber coupling aka fernco), connect a PVC 45 to the rear facing connection on the air intake ram (triangular shaped piece connected behind the grill), then join the two 45's with a nice straight section of PVC pipe. This still allows cold air to be drawn in from the grill, results in a simplified air stream, and does not require going into the fender. As with other CAI mods I expect one should be careful about driving into high water since I assume the stock silencer does provide a space for water to drop out before reaching the filter.

I have always wondered about the cold air issue with most of the intake modifications where air is drawn directly from the engine compartment. True the air flow has increased but now the engine is ingesting hot air. Does this defeat the purpose?
 
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