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Old 04-20-2013, 04:30 AM   #1
Scooby Newbie
Member#: 328627
Join Date: Aug 2012
Chapter/Region: NWIC
Location: Seattle area
1994 impreza wagon

Cool want to do jdm v5/v6 ej207 sti build. just got a few questions! a lot actually..

first of all, i have a 1994 usdm impreza GF8 wagon with a JDM ej207 v5/v6 swap in it. this car has been stolen, and needs new head gaskets. which i am in the process of replacing. but i have major plans for this motor once it is running well and had some questions about performance motor parts, because performance parts are a major bitch to find for this particular generation. So any parts dealers and/or manufacturers, that you know and trust, please let me know so I can research all of my options. In general I need lots of information and tips.

i don't wanna say i'm trying to cut any corners, but the cheaper the better, with out sacrificing quality. That being said, I'm set on doing this whole thing correctly. I'm not opposed to dedicating a good amount of cash for the RIGHT parts.

i want to hit 350-380 whp or more (400whp+), if it is immediately possible after upgrades are installed, via tune or etc. but i would be happy with 350-380 to start out with. for a safe/somewhat reliable daily driving build, i think this is a reasonable build goal. but just for **** and giggles(not saying i want to do this), if i was interested in building this motor to be as powerful as it could be, how much whp could i safely run with this engine if money wan't an issue?

i only really plan to run 91-92 octane fuel, because that's all that seems to be available around the seattle metropolitan area at the pump and i'm not entirely interested in always buying race fuel, as this is my daily driver. i'm looking for any information on performance engine parts including, but not limited to,

-front mount intercooler(was thinking about mishimoto universal? would love some reviews or information on mishimoto, godspeed, perrin, any other affordable fmic set up)

-performance pistons(i think i actually have forged pistons in this gen, but would love info about other aftermarket ones or if i even need them to reach my goal)

-forged piston rods

-performance cams

-exhaust(i already have a Y-valve on my exhaust so i can open it up to straight pipe by the flip of a switch right next to the drivers seat. which is ****ing cool, and i would love to keep)

-looking to do stage 2 clutch(been driving my roommates 05 usdm sti with exedy stage 2 clutch, feels beautiful)

-bigger turbo(running IHI vf-28 stock with my engine on 14.8 psi stock i'm pretty sure)

-performance ignition system

-performance radiator(once again looking into mishimoto, but open to any suggestions)

-Fuel system - i.e. : any suggested fuel pumps, fuel filters, injectors, fuel lines, etc...

-suspension(rocking stock suspension currently, which is mushy as hell, was thinking about gc8 sti suspension? would that work on a usdm GF8 wagon?)

-i understand that i will need a decent tune with any/all of these parts, i'm currently looking into local performance shops around the seattle area, that preferably build subies predominately, also open to suggestions on that.

one thing that i am HUGELY interested in knowing, is the order that i should do said mods in, i'm am having trouble understanding the way that significant motor upgrades will affect OEM parts that i haven't upgraded yet.

any insight, info, "do's and don'ts", or any stories about building the same or similar gen jdm motors are welcome, i'm really just looking for any information at all from people that have done similar projects! once again it's a JDM ej207 v5/v6. my friends and i will be doing most of the work ourselves, and then getting it professionally tuned. thanks for reading, looking forward to any info!

eat, sleep, boost,
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Old 04-20-2013, 03:27 PM   #2
Former Vendor
Member#: 207954
Join Date: Apr 2009

Hi Spencer,

As far as the intercooler goes, it depends on whether you are looking to replace your crash bar or not. We're in the process of developing a front mount kit that will handle the horsepower you are looking for (and more!), which will retain the OEM crash bar. Unfortunately its still a few months out.

I would recommend our new J Line intercooler if you are looking to build a kit. It is good for 500WHP. The SKU is MMINT-UJ / UJB (if you want it in black). I'm sure any reseller on this forum can assist you with a purchase.

As it relates to the radiator, you would need to decide on the standard 2-row core or our X-Line 3 row core. It really depends on what you plan on how aggressive you plan on driving and what other modifications you plan on doing which produce heat. As with any of our products, they are covered under our lifetime warranty.

I would also checkout our direct-fit oil cooler and new baffled catch can / air oir separator.

Hope this helps. Let me know if you have any specific questions related to the products.


Mike Sullivan
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Old 04-21-2013, 02:09 AM   #3
Scooby Specialist
Member#: 249130
Join Date: Jun 2010
Chapter/Region: NWIC
Location: North East Portland
1999 Ver5 STi RA
Aspen White


I just started a ver5/6 ej207 info thread about 3 days ago basically asking the same questions, but more detailed.. and I live in Portland
WelDun1 is offline   Reply With Quote
Old 04-21-2013, 10:27 PM   #4
Scooby Newbie
Member#: 221945
Join Date: Aug 2009
Default Engine build

You are at a critical point. Maybe you should take a cruise to Maxwell Power Systems in Marysville. Dom and the guys can point you in the right direction. Your engine choice will dictate some direction. JDM performance parts can be pricey.

You may of noticed on this site that some will rebuild their engines multiple times. This gets expensive. Do your rebuild right and not build multiple engines.

RexWagonWA is offline   Reply With Quote
Old 04-22-2013, 06:37 AM   #5
Scooby Newbie
Member#: 328627
Join Date: Aug 2012
Chapter/Region: NWIC
Location: Seattle area
1994 impreza wagon


Originally Posted by RexWagonWA View Post
You are at a critical point. Maybe you should take a cruise to Maxwell Power Systems in Marysville. Dom and the guys can point you in the right direction.
so far several different subie nuts from around here have told me to go to Dom at Maxwell Power, so i'm assuming he's like some scooby performance tuning master haha so i will be contacting him very shortly, as it seems like that's exactly what i need!

SO my current plans so far are to get into contact with maxwell, possibly take my car there for advice about the next project i have planned(didn't really talk about it in this post but i need to replace head gaskets and plug wires and while doing so i want to do a wire tuck and re-powdercoat my intake manifold and clean the **** out of my engine bay. that will be the very first thing i'll be spending money on) i want to get my car running PERFECTLY before i start ANY performance upgrades.

after i do all of that stuff i suppose i'll just be asking those guys how i can hit my power goal in the most efficiant/reliable way. it sounds like i have probably found a tuner that is respected/subaru performance specific that i'll probably be going back to also!
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