Intake Manifold Interchangibility Question...

JT99 · 02-22-2011, 12:56 PM

I have a phase II EJ22 car that is MAF. I'm working on a drop-in motor and need to pick up an extra IM to simplify the switch. Phase II EJ22 intake manifolds aren't the most plentiful, but some places list SOHC phase II EJ25 IMs as fitting my car too. Is that a typo or will a SOHC EJ25 IM fit phase II EJ22 heads?

I know DOHC IM is a completely different animal, but I have never had any parts from a SOHC 2.5 in my hands.

Anybody know for a fact that a SOHC EJ25 IM will or will not work with EJ22 heads?

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grafton · 02-22-2011, 03:44 PM

useless post/answer:

they should match, but I don't have a sohc 2.5 to look at to double check though

BAN SUVS · 02-22-2011, 07:49 PM

All the phase II NA manifolds are compatible.

RaceFaceXC · 02-22-2011, 08:36 PM

05+ are superior design, but might be harder to come by.

JT99 · 02-22-2011, 09:55 PM

Well that is certainly helpful information. Being MAF doesn't matter?

So what's the deal with the plastic IM? Is it an option as well for me?

Thanks for the replies.

BAN SUVS · 02-22-2011, 10:19 PM

You'll want to find a '99 RS manifold to keep things simple.

Storm · 02-23-2011, 06:21 AM

As said earlier, the phase II stuff will interchange. The plastic piece will bolt on, but needs modded for cable throttle body. The 05+ manifold is the same way but needs some other work too.

I've got a manifold that'll work for ya hangin in the garage if you're interested.
Jay

JT99 · 02-23-2011, 10:23 PM

Yeah, I just want a straight bolt-on that requires no modding.

Does your IM still have the fuel rails on it? What are you asking for it? Are you needing any misc. parts yourself?

Quote:

Originally Posted by Storm

As said earlier, the phase II stuff will interchange. The plastic piece will bolt on, but needs modded for cable throttle body. The 05+ manifold is the same way but needs some other work too.

I've got a manifold that'll work for ya hangin in the garage if you're interested.
Jay

Storm · 02-24-2011, 07:09 PM

Still has the rails but the injectors are not in. I could use a rust free rear subframe or a phase II EJ25 crankshaft that doesn't need machined.....

JT99 · 02-25-2011, 09:13 AM

I have a 2000 OBS shell from South Carolina waiting to have the underneath pulled off...but I won't be getting to that any time before July. You're more than welcome to come to KY with a wrench and a can of PB Blaster.

Storm · 02-25-2011, 06:24 PM

Tempting....but nah.

PM me if you'd like to talk price and contact info. I'm not out to screw anyone price wise.

Jay

ryden · 05-21-2011, 03:30 PM

i have a 97 obs and have a ej25 intake manifold laying around. i dont what year or phase but i see you guys said that if its phase II like my obs that it would bolt up. but would it actually do anything performace wise or just a waste of time?

ryden · 05-23-2011, 01:26 PM

anyone have any ansers for this?

BAN SUVS · 05-24-2011, 12:34 AM

It will not make any difference whatsoever to performance. Really, nothing will other than cams, header, headwork, and higher compression plus tuning. Nothing on the intake side is necessary until you really start building.

Zefy · 05-24-2011, 02:10 AM

how will getting a new intake manifold simplify the swap?

it takes minutes (~10 of them) to swap intake manifolds between motors. Leave everything on it (coil, wires, vacuum lines, fuel stuff) and just undo the 8 bolts. Replace the gaskets, away you go.

then you won't have to worry about a plug being different or anything like that.

<<<--- swapped 99 ej22 with 2003 ej25 using original manifold/wiring.

02-22-2011, 12:56 PM	#1
JT99 Scooby Newbie Member#: 177036 Join Date: Apr 2008 Location: Bowling Green, KY Vehicle: 1999 OBS Green	Intake Manifold Interchangibility Question... I have a phase II EJ22 car that is MAF. I'm working on a drop-in motor and need to pick up an extra IM to simplify the switch. Phase II EJ22 intake manifolds aren't the most plentiful, but some places list SOHC phase II EJ25 IMs as fitting my car too. Is that a typo or will a SOHC EJ25 IM fit phase II EJ22 heads? I know DOHC IM is a completely different animal, but I have never had any parts from a SOHC 2.5 in my hands. Anybody know for a fact that a SOHC EJ25 IM will or will not work with EJ22 heads? * Registered users of the site do not see these ads.

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grafton Scooby Specialist Member#: 187936 Join Date: Aug 2008 Chapter/Region: MAIC Location: Fairmont WV Vehicle: 97 Legacy w12:1CR 05 LL Bean outback	useless post/answer: they should match, but I don't have a sohc 2.5 to look at to double check though

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02-22-2011, 09:55 PM	#5
JT99 Scooby Newbie Member#: 177036 Join Date: Apr 2008 Location: Bowling Green, KY Vehicle: 1999 OBS Green	Well that is certainly helpful information. Being MAF doesn't matter? So what's the deal with the plastic IM? Is it an option as well for me? Thanks for the replies.

02-22-2011, 10:19 PM	#6
BAN SUVS Scooby Specialist Member#: 28685 Join Date: Nov 2002 Location: Reno, Nevada Vehicle: 2004 FXT 4EAT very STi'd	You'll want to find a '99 RS manifold to keep things simple.

02-23-2011, 06:21 AM	#7
Storm Scooby Guru Member#: 5218 Join Date: Mar 2001 Chapter/Region: MWSOC Location: SAUL'S Motorsports Vehicle: 96L Most Over- Developed Beater	As said earlier, the phase II stuff will interchange. The plastic piece will bolt on, but needs modded for cable throttle body. The 05+ manifold is the same way but needs some other work too. I've got a manifold that'll work for ya hangin in the garage if you're interested. Jay

02-24-2011, 07:09 PM	#9
Storm Scooby Guru Member#: 5218 Join Date: Mar 2001 Chapter/Region: MWSOC Location: SAUL'S Motorsports Vehicle: 96L Most Over- Developed Beater	Still has the rails but the injectors are not in. I could use a rust free rear subframe or a phase II EJ25 crankshaft that doesn't need machined.....

02-25-2011, 09:13 AM	#10
JT99 Scooby Newbie Member#: 177036 Join Date: Apr 2008 Location: Bowling Green, KY Vehicle: 1999 OBS Green	I have a 2000 OBS shell from South Carolina waiting to have the underneath pulled off...but I won't be getting to that any time before July. You're more than welcome to come to KY with a wrench and a can of PB Blaster.

02-25-2011, 06:24 PM	#11
Storm Scooby Guru Member#: 5218 Join Date: Mar 2001 Chapter/Region: MWSOC Location: SAUL'S Motorsports Vehicle: 96L Most Over- Developed Beater	Tempting....but nah. PM me if you'd like to talk price and contact info. I'm not out to screw anyone price wise. Jay

05-21-2011, 03:30 PM	#12
ryden Scooby Newbie Member#: 201489 Join Date: Jan 2009 Chapter/Region: NWIC Location: Longview, Wa Vehicle: 1997 OBS Metalic Matt Black	i have a 97 obs and have a ej25 intake manifold laying around. i dont what year or phase but i see you guys said that if its phase II like my obs that it would bolt up. but would it actually do anything performace wise or just a waste of time?

05-23-2011, 01:26 PM	#13
ryden Scooby Newbie Member#: 201489 Join Date: Jan 2009 Chapter/Region: NWIC Location: Longview, Wa Vehicle: 1997 OBS Metalic Matt Black	anyone have any ansers for this?

05-24-2011, 12:34 AM	#14
BAN SUVS Scooby Specialist Member#: 28685 Join Date: Nov 2002 Location: Reno, Nevada Vehicle: 2004 FXT 4EAT very STi'd	It will not make any difference whatsoever to performance. Really, nothing will other than cams, header, headwork, and higher compression plus tuning. Nothing on the intake side is necessary until you really start building.

05-24-2011, 02:10 AM	#15
Zefy Scooby Specialist Member#: 105104 Join Date: Jan 2006 Chapter/Region: VIC Location: Coquitlam, BC, Canada Vehicle: 1979 BRAT / 01 RSTI 99 2.5TS (DEAD) / 87 GL	how will getting a new intake manifold simplify the swap? it takes minutes (~10 of them) to swap intake manifolds between motors. Leave everything on it (coil, wires, vacuum lines, fuel stuff) and just undo the 8 bolts. Replace the gaskets, away you go. then you won't have to worry about a plug being different or anything like that. <<<--- swapped 99 ej22 with 2003 ej25 using original manifold/wiring.