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Old 02-22-2006, 12:35 PM   #1
Civic2Subie
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Default Stock Air Filter Question for '06, 2.5i

I'm planning on getting a hi-flow drop in panel filter for my new 2.5i (K&N, Perrin, etc.). I was nosing around my airbox the other day and the filter inside is red, just like a K&N filter. I thought normal stock paper filters were usually white? Does anybody know if they put upgraded filters in for '06, or is it just a stock filter that's red? It didn't look like a paper filter, but I didn't take the box lid all the way off so I could just see it through the crack. Also, does anyone know if a 2005 RS filter will fit, or are they a new shape/size for '06? There's not much info out there for the '06's yet, especially the 2.5i, so I have a hard time finding what I need. Are there any sights yet for 2.5i owners, like 25rs.com?
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Old 02-22-2006, 12:55 PM   #2
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No specific sites for us newer 2.5i owners, stick around here in the N/A section.

As far as the filter, not sure haven't looked into a new one yet. Have you desnorked the airbox yet? I found it worth the time, about 30 minutes total, throaty and it revs a bit quicker above 4k.

I'm in the process of researching the various aftermarket product & service options aval. for the 06 2.5i I'll keep you posted. Currently looking into some potential engine management / dyno tuning options.
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Old 02-22-2006, 02:30 PM   #3
Civic2Subie
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I haven't done the snorkusectomy yet. I did take the top black plastic piece off, but the white piece inside the fender is still there. What all did you have to do to get that white piece out? I also couldn't get the top of my airbox off all the way. I popped the two tabs on the side, but wouldn't come off. I'm sure there's another connector or something, but I didn't look that hard.
I'd like some engine mgt. too, I think I'm sold on the PerfectPower 6 from Rallitek.com. Get the plug and play hook up and you can change it back to stock when going to the dealership. There's lots of cool stuff it does. Kinda pricey, around $650 I think, but from the info and reviews I've read it will provide more gains than spending that much on bolt-on parts. Keep me posted on anything you find though. Haven't come across too many fellow 2.5i'ers yet. I know I absolutely love mine and from what I've read it has a lot of benefits over the MY05 and before. Equal length headers, VVT, no lag between 4k and 5k, and it tears ass all the way to 6k, plus all the electronic goodies (throttle control, brake distribution, speed sensative steering, etc.)! I LOVE every mile I drive in it!
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Old 02-22-2006, 02:57 PM   #4
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If I remember correctly my stock filter was red. I swapped it out for a Blitz drop-in because I noticed that once I did the silencer delete the filter was gunking up faster.
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Old 02-22-2006, 05:57 PM   #5
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I'd go thru my steps, but I did it a few months ago and I'm sure I'd forget something, I used the directions on scoobymods com. It sounds a bit involved, but you remove the front passenger tire, undo, but don't remove 4/5 of the plastic screws/clips holding the fender lining/water shield on the bottom and remove the plastic piece inside. I believe there are 3 clips on the airbox top, I think 1 is directly underneath the intake tube, should lift right off.

I'd hold off on the PP6, only tunes in 'open loop' which for the 06 2.5i doesn't start until approx. 4,700rpms. So you will only get benefits above 4,700rpm's, not really worth it.

I've been in touch with sean at Rallitek regarding this issue and here's what he's told me so far regarding the 06 2.5i. The PP7 is the better option for the 06 2.5i due to the fact it has a similar timing system to the WRX's, uses the same type of ECU connection, allows tuning in both open & closed loop(whole RPM range) and has better control features to allow it to control the VVT functions of the engine. The only problem is that no one has been in to get a dyno tune for thier 2.5i so sean has no maps to offer with the PP7.

And while the PP7 may appear more expensive, it comes with the plugNplay adapter for that price, so it's only I think $100 more than the PP6 + harness.

And since 99 out of 100 N/A impreza owners agree that the Cobb N/A access port won't be here until 2015 I am currently looking into a 3rd option. I have been in contact with a local subaru tuning shop regarding engine tuning/ECU reflashing involving a custom dyno tune. I should have some more info on this options in 2/3 weeks, I need to get my car to the shop as I may end up being the test subject for this 2.5i reflash.

Should this option fail I will probably look into the getting a custom dyno tune with the PP7, the shop I'm talking to said if the 1st option doesn't work they can tune it with the PP7.

And while it's my winter/dog/Mtn biking/snowboarding car I love driving it too, I find myself driving it more than my BMW. It's just a blast to drive
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Old 02-22-2006, 06:01 PM   #6
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Quote:
Originally Posted by Civic2Subie
I'm planning on getting a hi-flow drop in panel filter for my new 2.5i (K&N, Perrin, etc.). I was nosing around my airbox the other day and the filter inside is red, just like a K&N filter. I thought normal stock paper filters were usually white? Does anybody know if they put upgraded filters in for '06, or is it just a stock filter that's red? It didn't look like a paper filter, but I didn't take the box lid all the way off so I could just see it through the crack. Also, does anyone know if a 2005 RS filter will fit, or are they a new shape/size for '06? There's not much info out there for the '06's yet, especially the 2.5i, so I have a hard time finding what I need. Are there any sights yet for 2.5i owners, like 25rs.com?
I could not imagine Subaru installing something other than a stock airfilter in one of their new cars. Hwy61
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Old 02-23-2006, 08:52 AM   #7
Civic2Subie
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Yeah, I had read that the loop didn't start till higher rpms' on the 06, which does suck. I'll just save up and wait for the PP7 to come out. If I lived close to Rallitek I'd be there in a heartbeat to let them test it on my 2.5i, but I'm in central Indiana and if I remember right they're in the pacific north west? Quite a drive. I don't know of any places around here that do any kind of tuning or dyno stuff, especially for Subie's. There are probably some down in Indy but I don't get down there much, even though it's only an hour away. Sounds like the PP7 will be awesome though! Open and closed loop as well as VVT settings?! Yeah, I can't wait. The car is already awesome as it is, and I'd be willing to bet with intake/exhaust and the PP7 it will be good enough to make WRX owners jealous!! Well, maybe not quite that good, but I bet it will be pretty damn close! I have not missed the turbo for one second and I'd guess after these mods I'll be saying "Turbo? Who needs a turbo?". It already sounds like it has one anyway!
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Old 02-23-2006, 11:03 AM   #8
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Quote:
Originally Posted by Civic2Subie
I'm planning on getting a hi-flow drop in panel filter for my new 2.5i (K&N, Perrin, etc.). I was nosing around my airbox the other day and the filter inside is red, just like a K&N filter. I thought normal stock paper filters were usually white? Does anybody know if they put upgraded filters in for '06, or is it just a stock filter that's red? It didn't look like a paper filter, but I didn't take the box lid all the way off so I could just see it through the crack. Also, does anyone know if a 2005 RS filter will fit, or are they a new shape/size for '06? There's not much info out there for the '06's yet, especially the 2.5i, so I have a hard time finding what I need. Are there any sights yet for 2.5i owners, like 25rs.com?
I think the stock air filters are Purolator, like the oil filter
Very restrictive filter, any 05 filter will fit in the 06 since the intake setup is fairly the same.. I used a airhog for the longest time.
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Old 02-23-2006, 03:17 PM   #9
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where's rallitek located? Ill bring it if it's in cA

ahhh... oregon.. hmm
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Old 02-23-2006, 03:22 PM   #10
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so the pp7 would be like $750 total?
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Old 02-23-2006, 04:48 PM   #11
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alright i e-mailed rallitek... i am thinkin about driving up there for the test... but i need to know how much for this whole pp7 setup?
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Old 02-23-2006, 05:09 PM   #12
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$800 for the PP7 with the plugNplay harness included. And since you'll be the 1st 2006 2.5i you can get the dyno tune for free, heres the link to the offer on Ralliteks forum:

http://rallitekforums.com/forums/showthread.php?t=3162

Keep us posted, if you head up there it means I can order the PP7 in the spring with a MAP for my car.
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Old 02-23-2006, 05:37 PM   #13
06suba
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$800 isnt bad at all....

how come they are talkin about boost? i dont have a turbo

edit: im completely new to this stuff.... dont know much about it. any ifno is appreciated
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Old 02-23-2006, 07:19 PM   #14
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excuse me, for being my 1st post.

i too had probs taking off the filter cover, there's hooks on the bottum of the cover, i find it easier to take the whole tube off and then slide the cover down.
(i was gonna post pix of my snorkachop, obviously i dont have 5 posts yet )
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Old 02-23-2006, 08:01 PM   #15
06suba
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Quote:
Originally Posted by SubaDuba420
No specific sites for us newer 2.5i owners, stick around here in the N/A section.

As far as the filter, not sure haven't looked into a new one yet. Have you desnorked the airbox yet? I found it worth the time, about 30 minutes total, throaty and it revs a bit quicker above 4k.

I'm in the process of researching the various aftermarket product & service options aval. for the 06 2.5i I'll keep you posted. Currently looking into some potential engine management / dyno tuning options.
is this the link? http://www.scoobymods.com/forums/showthread.php?t=167

Last edited by 06suba; 02-23-2006 at 08:06 PM.
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Old 02-24-2006, 10:46 AM   #16
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Quote:
Originally Posted by 06suba
I think I used this one, you'll need to register to see the pics:

http://www.scoobymods.com/forums/showthread.php?t=113

and some of the links within it give better pictures of the unit inside the fender. From thier description and photos I was able to find the nut that is up front without removing much of the fender lining. I think the example they are using may be for a forester or WRX but it's the same setup for 06, I think the older imprezas were different. Anyway those instructions worked for me.

And as far as the PP7 I know on thier site it doesn't list it as being for the N/A 2.5 engine but I have exchanged several e-mails with sean and he said the PP7, while mainly designed for the turbo engines, would work better on the 2006 2.5i due the new VVt timing system and ECU similarities with the WRX/FXT/LGT. Not the same ECU, and I don't have a bunch of technical info, but sean said the PP7 would work in open & closed loop as well as having controls for the VVT timing and would be much better than the PP6 for the 06. I'm guessing they don't have it listed on thier site as being aval. for the 2.5i because A) they have no maps to offer and B) it's no secret they don't have the best web site and are working on it.

If you e-mailed sean he'll get back to you with the info, great guy as far as customer service, both sean & bernie have answered all my questions very quickly. And I got my 1st order in 3 days.
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Old 02-24-2006, 06:22 PM   #17
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To answer the original question, the air filter for the 2006 Impreza 2.5i is the same one as the 2005 Impreza 2.5, also older Impreza's with the 1.8, 2.0, and 2.2. And Legacy 2.2 and 2.5. The Outback 3.0 too. And the Baja, and even way back to the SVX 3.3. It's a very popular filter as it fits Datsun/Nissan, Infiniti and even a Saab.
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Old 02-25-2006, 02:45 AM   #18
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is a k&n filter worth it? i mean, does everyone change their air filter... does it do that much of a difference?
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Old 05-19-2006, 04:43 PM   #19
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soooo... 3 months later. has anybody gotten pp7? how are the new drop in filters working ot?
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Old 05-19-2006, 05:52 PM   #20
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As far as I know no one in the Pacific NW has been in to rallitek to have a N/A map made for the PP7, rallitek has no maps & i'm too far away to be the 1st. And I'm kinda surprised as the 1st person in gets a free dyno tune. I haven't been in touch with them in a while, plus thier forum is gone, so I haven't seen/heard of any updates on the PP7 for the 06 2.5i. And on thier newly redesigned web site they don't even list the PP7 as an option for the 2.5, so maybe I got some bogus info from sean on the whole PP7 / 2.5i deal.

As far as my own research on another potential "new" EM tuning option for the 06 2.5 N/A, I haven't made much progress as i'm now on the fence about getting rid of my 2.5i for a 06 WRX. I enjoy the car so much more than I expected, but I need a bit more power and the options for the 2.5 are just too limited.

of course theres always the Cobb "vapoware" that's on the way for the 05/06 2.5 N/A, the N/A Accessport should be out...........






sometime. Cobb says check the next issue of SubieSport for an update on the long missing Zero to Hero 2.5 project car.
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Old 06-03-2006, 05:26 PM   #21
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Default Removing Airbox Cover/STI Racing Air Filter/Snorkel

Hey, couple Qs: re: my 2006 2.5i Wagon (have 300 miles on her)

Where are the hooks on the bottom of the airbox cover located? Inside the cover or on the external bottom end of the cover, closer towards the engine -vs fender well side?

I have a STI Racing Air Filter (part # ST165464S000) I want to drop in, but don't feel like removing the air-intake-tube to slide the airbox cover down. The mechanics must have a process to just remove tha airbox cover.

Finally, for those who have removed the white restrictor or silencer tube from the fender well, thoughts on leaving the 'snorkle' in place to allow air to be forced into the fender well opening from the front grill area?

Since the airbox still has a outlet connected into the fender well with the restictor removed...seems to me, you would benefit from air being forced into the airbox, via this path

-MACE-
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Old 06-03-2006, 09:03 PM   #22
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Quote:
Originally Posted by MACE
Hey, couple Qs: re: my 2006 2.5i Wagon (have 300 miles on her)

Where are the hooks on the bottom of the airbox cover located? Inside the cover or on the external bottom end of the cover, closer towards the engine -vs fender well side?

I have a STI Racing Air Filter (part # ST165464S000) I want to drop in, but don't feel like removing the air-intake-tube to slide the airbox cover down. The mechanics must have a process to just remove tha airbox cover.

Finally, for those who have removed the white restrictor or silencer tube from the fender well, thoughts on leaving the 'snorkle' in place to allow air to be forced into the fender well opening from the front grill area?

Since the airbox still has a outlet connected into the fender well with the restictor removed...seems to me, you would benefit from air being forced into the airbox, via this path

-MACE-

BUMP, I wanna know this too!
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Old 06-04-2006, 01:48 AM   #23
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I'm also not sure about this, but a buddy of mine said that there is also a risk of water leaking into the fender wall, which then is vaccummed into the airbox via engine causing issues/problems?
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Old 06-04-2006, 02:08 AM   #24
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Quote:
Originally Posted by J-Chow
I'm also not sure about this, but a buddy of mine said that there is also a risk of water leaking into the fender wall, which then is vaccummed into the airbox via engine causing issues/problems?
REALLY? I dunno.
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Old 06-04-2006, 08:55 PM   #25
MACE
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Default Water Leaks

On both my 2005 WRX and STI, I removed the restrictor but left the snorkle in (see my previous post re: my thoughts about this) and after 15K miles on the WRX on 25K miles on the STI, the engine and turbo on both cars, still pulled hard and felt strong.

IMHO, no potential problems with water being sucked into the intake via the air-box

-MACE-

(still looking for feedback on where to find all the hooks, so I can remove the air-box cover without removing the tube)
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