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Old 07-18-2006, 11:20 PM   #1
SiNzz
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Default EJ22 Impreza L single/dual port heads

Hey everyone. Contemplating picking up a 99 impreza L sedan, and currently building up a list of possible minor upgrades for her. One of the parts I've come across is the borla catback setup, and header for the EJ22. My question is, which version do I use? I've been searchingg high and low to find out what years each different head design were used, and I can't seem to find out. Any help would be great! Thanks in advance.
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Old 07-18-2006, 11:21 PM   #2
DiscoWagon
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Single port. I used to have one before I swapped. Dual port is for 2.5L
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Old 07-19-2006, 07:40 AM   #3
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I have a single port borla header for sale right now

http://www.rs25.com/classifieds/show...1&cat=4&page=1
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Old 07-19-2006, 09:57 AM   #4
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'93 - '95 Imprezas with 2.2L are dual port, all others 'til the 2.5L shows up are single port.

If you want to get creative with your mods, find an older set of 2.2L heads a local junkyard. Clean them up and have delta cams do a regrind on the cams for $200. Then slap them on your block and put a set of Equal Length headers like the 2.5L guys can use. The heads should'nt cost more than $100 plus the cost of new head gaskets ($100 ish). You pick up some used EL headers with hi-flow cat for $400 and catback for $200. Or go with OBX EL headers for $275 from ebay and there catback for $225 new.

There you go $1000 and it'll will drive like a completely different car.

You could get crazy and another $1000 and have the heads port and polished but then you running into swap territory without the power potential.

You might also check out threads on the fabled "Frankenstein motor". Swap your block for a 2.5L shortblock and you have an instant high compression powerplant. I know 2.5L shortblocks can be had for as little as $100 at a junkyard. and the swap is not as hard as it might sound.

On the simpler side a CAI is relatively cheap power and the Borla's give decent power but our more valued for the beautiful music they make.

You might consider reading this thread (I'm such a whore) http://forums.nasioc.com/forums/show....php?t=1022154

Last edited by Rally_wgn; 07-19-2006 at 10:13 AM.
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Old 07-19-2006, 10:02 AM   #5
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Thats really interesting Rally_wgn, i didnt know you could do that.

But it there really an advantage of getting dual port heads instead of a single port head if both are stock?
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Old 07-19-2006, 10:06 AM   #6
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Well the real advantage is that the older heads flow a little better and the Equal Length Headers provide significantly better power gains than the Borla's do. Plus you'll know when your head gaskets were last done. This is also an opportunity to use and thinner gasket for a little more compression but I have no real data on any gains from that on the EJ22 motor.

Keep in mind that swapping the heads and the cams is near the advanced level of mechanical work and I would recommend a honest to goodness shop manual for this. Try North Ursalia's website, he has them on CD for a decent price. I love mine, find the procedure print the pages, keep them trashed with greasy fingerprints, rinse and repeat.

Subaru engine are super easy to work on with the right tools and the balls to just start tearing into it.

You could also post in your regional forum and see if anybody near has done any of this work and see if they'll help out for beer and pizza.

Last edited by Rally_wgn; 07-19-2006 at 10:23 AM.
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Old 07-19-2006, 10:07 AM   #7
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Quote:
Originally Posted by Rally_wgn
'93 - '95 Imprezas with 2.2L are dual port, all others 'til the 2.5L shows up are single port.

If you want to get creative with your mods, find an older set of 2.2L heads a local junkyard. Clean them up and have delta cams do a regrind for $200. Then slap them on your block and put a set of Equal Length headers like the 2.5L guys can use. The heads should'nt cost more than $100 plus the cost of new head gaskets ($100 ish). You pick up some used EL headers with hi-flow cat for $400 and catback for $200. Or go with OBX EL headers for $275 from ebay and there catback for $225 new.

There you go $1000 and it'll will drive like a completely different car.
I have been trying to find a way around the single port thing as well with my 98L, but is there an issue with OBDI and II between the heads since they are from different years (considering sensors and what not)
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Old 07-19-2006, 10:12 AM   #8
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Not to my knowledge, the ones i've pulled so far look exactly like the SOHC heads on my '96 with OBDII. There dont appear to be any sensors on the heads.

My next project(which i am collecting parts for now) will be a Phase II EJ25 shortblock with a set of '95 SOHC heads I have on an old EJ22 long block I bought to just learn how to take the thing apart. Compression jumps from the range of 10.1:1 to 11.3:1 for about 200hp at the crank. I plan on doing a dyno with stock exhaust to see what it makes and then slapping on a OBX Exhaust later. I already have a CAI but want a COBB because at least seat of the pants it feels better and sounds great compared to my Weapon R. As they can be had used for around $100, why not.

Last edited by Rally_wgn; 07-19-2006 at 10:18 AM.
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Old 07-19-2006, 10:21 AM   #9
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Yeah i knew that borla headers are for sound and not performance, thats why i kept my stock equal lenght one. Cool info anyways

I think you can get the cams from the single port grinded by delta too.
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Old 07-19-2006, 06:32 PM   #10
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rallywgn. i have a phase2 sb and a long block from a 96 obs are those sohc heads the same as the 95 sohc ones?
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Old 07-19-2006, 08:23 PM   #11
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Thanks alot, rally_wagn, and all the others. Definitely going to consider my options, and continue my research. Going over to my local insurance office to find out a quote today for my other alternative, a 2.5RS, netted me a naerly 4k (CA$) per year premium. Ouch. So needless to say an L is evermore tempting. Ah, the joys of being an 18 year old male. Thanks again for the info, nasioc rocks!
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Old 07-19-2006, 09:46 PM   #12
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gc835, my obs has single exhaust port heads, but the frankenstein concept still works you just cant take advantage of the equal length headers as they require dual exhaust ports. YOu have the right block and with a borla header you could easily make a frankenmotor, catback and CAI will still yield good gains as will cam and head work.

Be patient and look around for some of the older heads and see ppl selling whole pre-'96 Ej22's for $200 -$300 dollars.
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Old 07-20-2006, 01:17 AM   #13
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im running the borla cat back with borla headers on my 97' L right now and i couldnt be happier. i also have a CAI, and i think its enough to get me from point A to point B.
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Old 07-20-2006, 01:24 AM   #14
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with the money you would save on insurance a year, you could have a "L" model impreza that is faster than a 2.5RS. you could throw in a sti motor and they cant charge you more for your insurance. you just have to pass emissions......


~Josh~
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Old 07-20-2006, 03:55 AM   #15
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True, ballitch. But by the time my budget allows for an STI engine swap I'll probably be eyeing an STI. It's been my plan to get one of those since I was in 9th grade. I'll probably just do minor mods...if anyones interested, here's a rundown list of my initial ideas:

Enkei J10's or similar black rim
eibach springs
kyb shocks (maybe)
borla catback+header, kn filter
maybe a wrx brake upgrade in the future.

just basic stuff, but hopefully it'll be a nice clean ride.
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Old 07-20-2006, 05:41 AM   #16
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Quote:
Originally Posted by Rally_wgn
You could also post in your regional forum and see if anybody near has done any of this work and see if they'll help out for beer and pizza.
Pizza and beer always works in t3h MAIC
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Old 07-20-2006, 07:27 AM   #17
Rally_wgn
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Sinzz I would make the KYBs a definite as well as some swaybars. Rallitek has a complete swatbar package for $325. with the springs you will have a great riding and handling car.
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Old 07-20-2006, 04:09 PM   #18
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Thanks for the heads up again, Rally_wgn. I will also look into the the local chapter, (I know Van BC has alot of suby owners). As for the beer+pizza deal, I can provide the pizza, but being 18 I cant' exactly buy the beer...legally .
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Old 07-20-2006, 04:43 PM   #19
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I've been looking at building the EJ25/Dual Port EJ22 hybrid since I heard about it upping the CR to 11.3:1. I'm very anxious to see how much power you could put down with that CR, EL headers, intake, and pullies. I haven't heard if you need to run higher octane fuel though, as you would with a turbo kit or ~12:1 pistons.

Right now I have a phase 2 EJ25 that I can buy and I'm trying to find a set of EJ22 Dual Port heads...send the cams off for a regrind and there ya go.
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Old 07-20-2006, 07:47 PM   #20
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That sounds awesome! Keep me updated. Good luck with it too, and thanks for the help, nice to see older guys helpin out the youngins like me...I'm just tryin to learn as much as I can. Just to add a somewhat straightforward question though: I'm assuming a catback (the borla in question) will give me the "boxer rumble" but I'm also assuming it would be much louder/prominent with the added unequal headers? It seems funny that people would shy away from the EL because of the reduction in the pulses, and the rumble, but I can definitely understand why they'd do it.
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Old 07-20-2006, 07:57 PM   #21
Rally_wgn
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Hey Perdue my friend has a set of dual ports for $100 if your interested. He was going to do a hybrid and then picked up a 2.5L for cheap and we are swapping that this weekend instead. I dont know much about the heads except we pulled them off of a Subie with 123k on the odo. PM me if your interested and I'll get him in touch with you.


Sinzz pizza and Coca-cola will do as well ( I refrained from use the word Coke as it may have been misinterpreted )

the borla headers are a larger contributer as I understand it, but the catback helps.
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Old 07-20-2006, 09:01 PM   #22
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Sinzz, I had a header-back exhaust made with 2.25" pipe, a high flow cat, Borla Turbo Muffler, and Borla oval tip. Without the header, you can hear the "rumble" at idle and in the lower rpms, but it fades the higher you go. When I had my Borla header on, a guy standing at the fire department swore a V8 with an exhaust was coming down the road when I was en route to the station to get a truck...he was suprised. Unfortunately, my header gave me too many problems to justify keeping it on the car.

That being said, I believe I have videos of my exhaust with and without the Borla Headers. I'll post'em up up if I can find them again.
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Old 07-21-2006, 12:20 PM   #23
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whitch hg do you use for phase 2 block and96 obs heads?
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