Welcome to the North American Subaru Impreza Owners Club Friday August 1, 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 > Normally Aspirated Powertrain

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 12-04-2008, 06:23 AM   #1
gecko7
Scooby Newbie
 
Member#: 195984
Join Date: Nov 2008
Default 2.5RS NA header measurement

hi all.. i got a noob qn to ask the gurus in here..
anyone knows whats the diameter / measurement of the internal bore of the 2.5RS NA header / extractor? and also, anyone got any picz on how does a stock 2.5RS NA header / extractor looks like thks lots..
* Registered users of the site do not see these ads.
gecko7 is offline   Reply With Quote
Old 12-04-2008, 10:17 PM   #2
RaceFaceXC
NASIOC Supporter
 
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

Default

What part of the header? the primaries @ the head or the collector outlet? I can get you pics/measurements of the stock 2.5i (2006-07)header, but its a EL design and different from the 2.5RS(2005). there are pics on NASIOc in several places, try some seraches for thread pertaining to swapping the stock headers from a 2.5l to a 2.2l or something that would make sense to do.
RaceFaceXC is online now   Reply With Quote
Old 12-05-2008, 12:25 PM   #3
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

i have a stock 2000 header/cat section sitting in the garage. if you want, i can get sizes/pics. i believe stock is 1 7/8"
yarrgh is offline   Reply With Quote
Old 12-06-2008, 10:32 AM   #4
gecko7
Scooby Newbie
 
Member#: 195984
Join Date: Nov 2008
Default

hi bro thks for the reply.. hmm should be the overall internal diameter from the head till the outlet.. currently my ride is year 2003.. therefore i believe only the 2.5RS(2005) will be more useful to me right? oh ya btw im from singapore, the car that im driving now is a 1.6l impreza NA.. in singapore there's no 2.5RS.. but i believe that a 2.5RS header / extractor able to fit my ride.. cos i might need to custom made a header / extractor that is exactly the same as the original 2.5RS header / extractor, therefore i require the diameter information in order to custom made.. b'cz in singapore, its very rare to find a 2.5RS header / extractor.. thks lots all for the help..

Quote:
Originally Posted by RaceFaceXC View Post
What part of the header? the primaries @ the head or the collector outlet? I can get you pics/measurements of the stock 2.5i (2006-07)header, but its a EL design and different from the 2.5RS(2005). there are pics on NASIOc in several places, try some seraches for thread pertaining to swapping the stock headers from a 2.5l to a 2.2l or something that would make sense to do.
gecko7 is offline   Reply With Quote
Old 12-06-2008, 10:35 AM   #5
gecko7
Scooby Newbie
 
Member#: 195984
Join Date: Nov 2008
Default

is the same as the 2.5RS NA (2005) header? perhaps you wana post picz for reference? thks lots bro..

Quote:
Originally Posted by yarrgh View Post
i have a stock 2000 header/cat section sitting in the garage. if you want, i can get sizes/pics. i believe stock is 1 7/8"
gecko7 is offline   Reply With Quote
Old 12-06-2008, 10:48 AM   #6
RaceFaceXC
NASIOC Supporter
 
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

Default

the internal diameter changes from the head to the collector outlet. the primaries will be smaller than the secondaries, which will be smaller than the collector outlet.

Also, the 2.5L header may be too large for what your engine flows. keeping the exhaust velocity high is the big concern and a larger internal diameter will cause a drop in velocity if its too big.

Do your heads have single or dual port exhaust outlets?
RaceFaceXC is online now   Reply With Quote
Old 12-06-2008, 11:03 AM   #7
gecko7
Scooby Newbie
 
Member#: 195984
Join Date: Nov 2008
Default

hi bro my stock header / extractor looks like this as shown below :



cos i intend to get the 2.5RS intake manifold, which shd be able to source in my country.. therefore perhaps i can custom made the header to compensate for the exhaust flow..

oh ya by the way.. i a bit confuse by the head to the collector outlet. Which one you refer to is head and collector outlet? Then, how about the primaries and secondaries that you mentioned?

Quote:
Originally Posted by RaceFaceXC View Post
the internal diameter changes from the head to the collector outlet. the primaries will be smaller than the secondaries, which will be smaller than the collector outlet.

Also, the 2.5L header may be too large for what your engine flows. keeping the exhaust velocity high is the big concern and a larger internal diameter will cause a drop in velocity if its too big.

Do your heads have single or dual port exhaust outlets?
gecko7 is offline   Reply With Quote
Old 12-08-2008, 09:22 PM   #8
gecko7
Scooby Newbie
 
Member#: 195984
Join Date: Nov 2008
Default

hmm hi there anyone to help? hee..
gecko7 is offline   Reply With Quote
Old 12-23-2008, 01:51 PM   #9
gecko7
Scooby Newbie
 
Member#: 195984
Join Date: Nov 2008
Default

hi anyone got the picz of 2.5rs header? thks lots
gecko7 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
2.5RS NA header measurement gecko7 Newbies & FAQs 7 12-04-2008 11:32 AM
fs/ft: spt catback exhaust/2.5rs na motor psi-rst MAIC Private Classifieds 6 10-18-2008 08:22 PM
WTB: 2000 2.5rs NA cat back bue car Private 'Wanted' Classifieds 3 08-30-2008 02:21 PM
2.5rs/na to turbo.....????? Einsti3n Alaskan Impreza Club Forum -- AKIC 9 09-21-2003 03:48 PM
Knock with 2.5RS NA & Link PLus seven881 Engine Management & Tuning 14 05-05-2003 05:25 PM


All times are GMT -4. The time now is 11:22 PM.


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.