EJ22 duel port exhaust?
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Posts: 138
From: Wisconsin
Car Info: 94 impreza sedan
I'm gonna take a guess that in the 93's though 96 came in a duel port and 97 is when the body and everything changed and the hp on the EJ22 and since everyone who has the single port so far has a 97+ thats what would of happen but why did they do it is it for hp?
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Joined: Mar 2003
Posts: 137
From: Elkton, Virginia
Car Info: 1998 Subaru Impreza L 2.2
dual vs single port heads
Two ports are better than one. The two port heads flow better air in and gases out. All together, the two port heads breathe better. Which is better, having one nose hole or two? It sure is easier to breathe with two.
-Charles-
-Charles-
Thread Starter
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From: Wisconsin
Car Info: 94 impreza sedan
wile ImprezaVA has a good point I do wanna say a few things the 97 or 98+ impreza's EJ22 single port has more hp than the duel port 97 or 98 and down now I don't know where u get that extra 5hp or so but u'd think as a car gets newier you'd think it'd improve. Also as far as headers go a 4 and 1 header is better than a 4-2-1 header.
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there has to be a reason that they would change it. does the hp gain have anything to do with the ports?? if not wouldnt the improvement have been better had they changed whatever they did and kept the original dual ports? Doesnt make sense though, if there wasnt some advantage to the single ports then they wouldnt have redesigned them.... right??
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Posts: 138
From: Wisconsin
Car Info: 94 impreza sedan
well one thing I do know is some restriction will creat more torque like if u have a huge exhast you'll have more hp at the top and if u put a sliencer on it you'll have more bottem end power and a single port might be more restive in some sense to create more torque or I might just be talking out of my *** but hey who knows 
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so you mean to create back pressure? Kinda makes sense. I understand that changing the intake and exhaust on the ej22 and ej25 only will make slight gains in hp... (they all come equiped with cold air intakes to begin with) and maybe this is the reason that the exhaust makes no differance.
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Joined: Mar 2003
Posts: 137
From: Elkton, Virginia
Car Info: 1998 Subaru Impreza L 2.2
more HP
I don't know where u get that extra 5hp or so but u'd think as a car gets newier you'd think it'd improve.
the 2.2 and 2.5 engines were made more
fuel efficient, more powerful, and were
given a flatter, more usable torque curve
than in previous years. To achieve these
objectives, it was necessary to make
improvements and modifications to the
Subaru engine lineup. The following are
some of those improvements:
• Mechanical valve lash adjusters
(reduces friction),
• Lightweight pistons (reduces inertia),
• Short skirt, Molybdenum coated pistons
(reduces friction),
• Increased compression ratio (improved
power output),
• Improved cylinder head design
(improved cooling),
• Improved induction system
(improved breathing).
Also, I'm not dead sure on this, but didn't they stop making the dual port heads in '95? I read this somewhere.
EDIT: p_vesper & scobaru: I'll be able to tell you if a cat-back + intake will make difference as soon as I get my Magnaflow muffler. I've already ripped out the snorkel and will be adding a K&N panel filter (3320312) from advance auto.
Info source: http://www.endwrench.com/pdf/engine/...iseInfoS01.pdf
http://www.partsamerica.com/SelectPa...For=Air+Filter
-Charles-
Last edited by ImprezaVA; May 7, 2003 at 09:58 AM.