Welcome to the North American Subaru Impreza Owners Club Tuesday July 22, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Subaru Conversions

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 05-24-2010, 01:54 AM   #1
tempest24
Scooby Newbie
 
Member#: 197772
Join Date: Dec 2008
Chapter/Region: International
Location: Guam
Vehicle:
2007 STi
new formula red

Default JDM Exhaust

hi all,

i want to install an Amuse Powerhouse exhaust...but i know the downpipe from usdm and jdm are different...i was told i need to change a bunch of things....just wanted to know wat i need to convert into jdm to do this...

i have a 2007 usdm STi

thanks
* Registered users of the site do not see these ads.
tempest24 is offline   Reply With Quote
Old 05-24-2010, 09:42 AM   #2
nito822
Scooby Newbie
 
Member#: 50490
Join Date: Dec 2003
Chapter/Region: South East
Location: Holly Springs, NC
Vehicle:
07 097/800 UGM STI
Dirty

Default

From what ive read on this site, the JDM length DP's are shorter than USDM. So the JDM Amuse cat-back will be longer than the OEM USDM piece.

You can either modify the DP/Cat-back lengths or try to source a JDM DP that has the proper flange for your turbo.
nito822 is offline   Reply With Quote
Old 05-24-2010, 11:03 AM   #3
yaya20
Scooby Specialist
 
Member#: 130354
Join Date: Oct 2006
Chapter/Region: NESIC
Location: CT
Default

^Correct. I'm going through this right now trying to mate up a JDM catback. My USDM downpipe is about 4" too long and we'll be shortening it to work with the JDM catback.
yaya20 is offline   Reply With Quote
Old 05-25-2010, 12:01 AM   #4
tempest24
Scooby Newbie
 
Member#: 197772
Join Date: Dec 2008
Chapter/Region: International
Location: Guam
Vehicle:
2007 STi
new formula red

Default

so its just the DP...? i was told by someone in philippines for usdm to run a jdm exhaust u need to change the DP turbo manifold from single scroll to twin and oil pan...


true?
tempest24 is offline   Reply With Quote
Old 05-25-2010, 08:35 AM   #5
yaya20
Scooby Specialist
 
Member#: 130354
Join Date: Oct 2006
Chapter/Region: NESIC
Location: CT
Default

Depends on what your car has and what you are trying to fit to it. Do you have a single scroll or twin scroll turbo/downpipe? Is the Amuse exhaust a turboback, catback, etc...?

The USDM downpipe is single scroll and longer than the twin scroll JDM downpipe.
yaya20 is offline   Reply With Quote
Old 05-25-2010, 08:39 AM   #6
tempest24
Scooby Newbie
 
Member#: 197772
Join Date: Dec 2008
Chapter/Region: International
Location: Guam
Vehicle:
2007 STi
new formula red

Default

hi all i just spoke with my local dealer and the tech there explained it a little bit just wanna see if everyone here would agree.

jdm = twin scroll up-pipe, shorter downpipe due to shorter cat & exhaust 101"
usdm = single scroll up-pipe, longer downpipe 4" & exhaust 97"

so i would need to change to an unequal length exhaust manifold with a twin scroll up-pipe and jdm length downpipe to install a jdm exhaust...

now i heard the jdm exhaust manifold is a different size from the usdm so you would need to match the oil pan to be jdm spec as well...

can some clarify regarding the oil pan issue...dealer tech said no need...true?
tempest24 is offline   Reply With Quote
Old 05-25-2010, 10:16 AM   #7
yaya20
Scooby Specialist
 
Member#: 130354
Join Date: Oct 2006
Chapter/Region: NESIC
Location: CT
Default

Dude, a twin scroll downpipe will not mate up to a single scroll turbo. The flange on the hotside is different to accomodate the dual wastegate flappers.

It's sounds like your car is USDM spec, correct? If so, then you would also need a twin scroll turbo. That's a lot of stuff to change out for an exhaust...
yaya20 is offline   Reply With Quote
Old 05-25-2010, 08:38 PM   #8
tempest24
Scooby Newbie
 
Member#: 197772
Join Date: Dec 2008
Chapter/Region: International
Location: Guam
Vehicle:
2007 STi
new formula red

Default

i see...i knew i had to ask cuz it didnt seen correct...thanks and yes its usdm and yes it is a lot to change out for an exhaust but i really want to put on a amuse exhaust system...
tempest24 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Just a random thought on JDM exhaust vs USDM exhaust Kevex Factory 2.5L Turbo Powertrain 2 04-14-2004 06:35 AM
JDM exhaust system, which downpipe rupert Factory 2.0L Turbo Powertrain 9 06-01-2003 01:08 PM
looking for the quietest JDM exhaust BlueWRX Factory 2.0L Turbo Powertrain 2 03-23-2003 12:08 AM
JDM exhaust question... KillerRex Factory 2.0L Turbo Powertrain 1 05-16-2002 06:30 AM
will jdm exhaust bolt onto stock USDM WRX? DV Motorsports Factory 2.0L Turbo Powertrain 12 04-01-2002 07:34 PM


All times are GMT -4. The time now is 03:59 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.