Welcome to the North American Subaru Impreza Owners Club Saturday July 26, 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 > Factory 2.5L Turbo 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 08-04-2007, 01:06 PM   #1
VRT Gump
Scooby Newbie
 
Member#: 142698
Join Date: Mar 2007
Location: Monterey, CA
Vehicle:
2006 Subaru
Aspen White

Default equal vs unequal length headers on an 06 TR

would unequal length headers on an 06 tr help or hinder the overall performance. I picked up coated headers and they are unequal length. Would putting them on help me out power wise?
* Registered users of the site do not see these ads.
VRT Gump is offline   Reply With Quote
Old 08-04-2007, 01:29 PM   #2
All4bSpinnin
Scooby Guru
 
Member#: 99102
Join Date: Oct 2005
Chapter/Region: South East
Location: Jax, FL
Vehicle:
08 Corvette Z06
problem Traction?

Default

it sure would, you would see about 10 more hp, and a lot more torque


its going to hurt the boxer rumble though...


here ya go!

http://forums.nasioc.com/forums/showthread.php?t=601219
All4bSpinnin is offline   Reply With Quote
Old 08-04-2007, 01:57 PM   #3
VRT Gump
Scooby Newbie
 
Member#: 142698
Join Date: Mar 2007
Location: Monterey, CA
Vehicle:
2006 Subaru
Aspen White

Default

I thought the unequal headers had the rumble. The 06TR has equal length headers.
VRT Gump is offline   Reply With Quote
Old 08-04-2007, 02:07 PM   #4
Unabomber
Big Ron
Moderator
 
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
Vehicle:
on car parts so PM
me b4 j00 buy

Default

I hope in future you read the sticky threads and NO Subaru has equal length headers.
Unabomber is offline   Reply With Quote
Old 08-04-2007, 02:15 PM   #5
VRT Gump
Scooby Newbie
 
Member#: 142698
Join Date: Mar 2007
Location: Monterey, CA
Vehicle:
2006 Subaru
Aspen White

Default

Unabomber. there are way to many stickies and to much information to go through to find a simple answer sometimes. I am currently on page 8 of the third thread about headers and no one has answered the question I am looking for. I thought the 06 had equal length headers, my bad if I was told wrong. I just wanted to know if I would see an increase in power with the new headers. since they are both unequal, I guess not.
VRT Gump is offline   Reply With Quote
Old 08-04-2007, 02:20 PM   #6
intpostman23
Scooby Specialist
 
Member#: 89185
Join Date: Jun 2005
Chapter/Region: Tri-State
Location: Brick, NJ
Vehicle:
2004 IMPREZA WRX STI
-Chargespeed V2- WRB

Default

every time someone says read the stickies i think to myself... is this a forum or am i just reading info on a site... isn't a forum where people communicate with each other... who cares if the same question is asked... does it really bother people that much... if you spend your whole day looking at this site and really care that much about what people post i feel for you..
intpostman23 is offline   Reply With Quote
Old 08-04-2007, 02:21 PM   #7
atomicfire
Scooby Specialist
 
Member#: 136296
Join Date: Dec 2006
Chapter/Region: TXIC
Location: Midtown, Houston, TX
Vehicle:
2005 STi
OBP

Default

Quote:
Originally Posted by Unabomber View Post
I hope in future you read the sticky threads and NO Subaru has equal length headers.
The JDM Spec-C has equal length headers stock from the factory.
atomicfire is offline   Reply With Quote
Old 08-04-2007, 02:26 PM   #8
npower
Scooby Newbie
 
Member#: 152960
Join Date: Jul 2007
Chapter/Region: TXIC
Location: Plano
Vehicle:
07 STI
WR Blue

Default

Quote:
Originally Posted by intpostman23 View Post
every time someone says read the stickies i think to myself... is this a forum or am i just reading info on a site... isn't a forum where people communicate with each other... who cares if the same question is asked... does it really bother people that much... if you spend your whole day looking at this site and really care that much about what people post i feel for you..
I have pondered this myself, it really does not bother me when people ask simple questions, but some threads get old time and time again who knows
npower is offline   Reply With Quote
Old 08-04-2007, 02:45 PM   #9
VRT Gump
Scooby Newbie
 
Member#: 142698
Join Date: Mar 2007
Location: Monterey, CA
Vehicle:
2006 Subaru
Aspen White

Default

http://forums.nasioc.com/forums/show...06+wrx+headers
06 impreza 2.5i does have equal legth headers as well.

I guess the 06 is unequal so changing it out with another unequal would probably help exhaust flow a little and the coating will help reduce heat soak. I will just have to dyno it to see any difference.
VRT Gump is offline   Reply With Quote
Old 08-04-2007, 03:05 PM   #10
Unabomber
Big Ron
Moderator
 
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
Vehicle:
on car parts so PM
me b4 j00 buy

Default

Understand something here folks and this is not personal on anyone here, but I get this often, so listen up:

We have stickys for a reason. Why? Because the same question over and over and over and over and over gets damned boring.

In this case, even a blind man would have found the Header FAQ. Inside that thread are multiple examples of header gains. You'd honestly have to be damned blind not to see the gains in the FIRST POST of the Header FAQ.

We do not have JDM Subaru here and this certainly isnt the 2.5i forum, so you people need to quit trying to one up me with your factoids.

If you can't read the FAQs or don't want to and want to hold hands, sing Kumbaya, and "talk", please do so in the Newbies and FAQ forum. These forums are dedicated to engaged conversation about old topics with facts and new insight and new topics for discussion. Don't like it? Then I'll let this forum go to hell in a handbasket with 90% of the posts asking about swaybars and AccessPORTs and then see how you like it.
Unabomber is offline   Reply With Quote
Old 08-04-2007, 03:09 PM   #11
wrxfactor
Scooby Specialist
 
Member#: 49978
Join Date: Dec 2003
Chapter/Region: NESIC
Location: Shrewsbury, MA
Vehicle:
2002 WRX w/ JDM STi
6spd, EJ255, VF39 & EWG

Default

Quote:
Originally Posted by All4bSpinnin View Post
it sure would, you would see about 10 more hp, and a lot more torque
its going to hurt the boxer rumble though...
Equal length headers are the ones that "remove" the boxer rumble. They do help produce more torque and hp, but it is all relative to the size of the turbo.

Quote:
Originally Posted by VRT Gump View Post
I thought the unequal headers had the rumble. The 06TR has equal length headers.
Uh, yes and no. Unequal length headers had the rumble, but I haven't seen anything to prove that the 06TR has equal length headers.

Quote:
Originally Posted by Unabomber View Post
I hope in future you read the sticky threads and NO Subaru has equal length headers.
Come on Ron, you know this isn't right. However, unlike the others, I assume you meant turbo platform USDM Subaru. So in that case, you're correct, and I agree.

Quote:
Originally Posted by VRT Gump View Post
Unabomber. there are way to many stickies and to much information to go through to find a simple answer sometimes. I am currently on page 8 of the third thread about headers and no one has answered the question I am looking for. I thought the 06 had equal length headers, my bad if I was told wrong. I just wanted to know if I would see an increase in power with the new headers. since they are both unequal, I guess not.
Don't bitch about the stickies. I'm tired of people crying about it. Do you know how much time Ron has put into making those? How many people he contacted to make sure he was posting good and accurate information? Yes, you were told wrong about the headers. You will get more power if the internal diameter of the piping is bigger, because they will flow more. However, they're not cast iron like the stock manifold, so they won't retain heat as well, which is why people coat them, wrap them, or a combo of both.

Quote:
Originally Posted by intpostman23 View Post
every time someone says read the stickies i think to myself... is this a forum or am i just reading info on a site... isn't a forum where people communicate with each other... who cares if the same question is asked... does it really bother people that much... if you spend your whole day looking at this site and really care that much about what people post i feel for you..
I feel for you buddy, because not reading and just asking simple questions that don't need to have threads started destroys the whole point of what NASIOC can do. This website is a Subaru information superhighway; there is probably more information here than you understand. NASIOC is a place for Subaru owners to communicate, yes, but it's also a place to find answers to your questions. The stickies take time and effort, and obviously people like you do not appreciate it.

Quote:
Originally Posted by atomicfire View Post
The JDM Spec-C has equal length headers stock from the factory.
Congrats, you're correct. It's also twin scroll, necessitating the need for equal length. I don't think Ron meant every Subaru, as I said above.

Quote:
Originally Posted by npower View Post
I have pondered this myself, it really does not bother me when people ask simple questions, but some threads get old time and time again who knows
It does get old, and it takes up space on the servers of the forever growing NASIOC. It's like some of you think that this massive operation that is over 150k members is simply a drop in the bucket for cost.

- Chris
wrxfactor is offline   Reply With Quote
Old 08-04-2007, 03:11 PM   #12
wrxfactor
Scooby Specialist
 
Member#: 49978
Join Date: Dec 2003
Chapter/Region: NESIC
Location: Shrewsbury, MA
Vehicle:
2002 WRX w/ JDM STi
6spd, EJ255, VF39 & EWG

Default

Quote:
Originally Posted by Unabomber View Post
We do not have JDM Subaru here and this certainly isnt the 2.5i forum, so you people need to quit trying to one up me with your factoids.

If you can't read the FAQs or don't want to and want to hold hands, sing Kumbaya, and "talk", please do so in the Newbies and FAQ forum. These forums are dedicated to engaged conversation about old topics with facts and new insight and new topics for discussion. Don't like it? Then I'll let this forum go to hell in a handbasket with 90% of the posts asking about swaybars and AccessPORTs and then see how you like it.
Ron, please don't let it go to that. Is there any way to ban people or give them a timeout from a specific forum? It seems like it would be a great way to teach noobs a lesson. I agree about the 2.5i, this is the damn 2.5L Turbo Forum, so shut up about an N/A car, Subaru or not!
wrxfactor is offline   Reply With Quote
Old 08-04-2007, 03:27 PM   #13
VRT Gump
Scooby Newbie
 
Member#: 142698
Join Date: Mar 2007
Location: Monterey, CA
Vehicle:
2006 Subaru
Aspen White

Default

north American Subaru IMPREZA owners club of america. there are tons of posts about N/A subarus in here.

on a side note, I did see the headers sticky that I missed the first time. I have read a ton about this and have now learned to not ask any questions on nasioc as you always get flamed or "read the damn sticky"
VRT Gump is offline   Reply With Quote
Old 08-04-2007, 03:49 PM   #14
atomicfire
Scooby Specialist
 
Member#: 136296
Join Date: Dec 2006
Chapter/Region: TXIC
Location: Midtown, Houston, TX
Vehicle:
2005 STi
OBP

Default

aside from the ensuing flame war, aftermarket headers CAN help with performance, but some will come at the expense of less low end torque, which will be made up by upper-RPM gains. Even though some headers are marketed as "unequal length", they may change the tone of the exhaust slightly, making the exhaust note slightly higher pitched.

People have said the stock headers are designed pretty well already, and there are minimal gains from getting an ftermarket header. I am not going to get a header until I am well into the 400AWHP range.

It is true the JDM Spec C and the 06+ N/A Impreza's have equal length headers. I just misunderstood what Unabomber said; I thought he meant that no Subaru ever made had equal length headers, but he actually meant no USDM turbo subaru ever had equal length headers. My apologies. If anyone is interested in hearing what a stock equal length header sounds like on a 07 N/A Impreza, I have a video here:

http://www.youtube.com/watch?v=l24GyIQfw8Q

Hope this helps.
atomicfire is offline   Reply With Quote
Old 08-04-2007, 04:05 PM   #15
intpostman23
Scooby Specialist
 
Member#: 89185
Join Date: Jun 2005
Chapter/Region: Tri-State
Location: Brick, NJ
Vehicle:
2004 IMPREZA WRX STI
-Chargespeed V2- WRB

Default

lol, this got a little out of hand!
intpostman23 is offline   Reply With Quote
Old 08-04-2007, 04:11 PM   #16
VRT Gump
Scooby Newbie
 
Member#: 142698
Join Date: Mar 2007
Location: Monterey, CA
Vehicle:
2006 Subaru
Aspen White

Default

the only stupid questions are the ones not asked. I was under the impression that the 06 WRX had equal length headers. My bad on that one. And the sticky about the headers did not have any tests done with a EJ25. I found the answer out now so I am happy with that.

is there a sticky that shows the 06 WRX tested with different headers anywhere?
VRT Gump is offline   Reply With Quote
Old 08-04-2007, 04:47 PM   #17
Unabomber
Big Ron
Moderator
 
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
Vehicle:
on car parts so PM
me b4 j00 buy

Default

There is no test on the 06 nor will there probably ever be. A Subaru motor is a Subaru motor so if you read all the tests, you'll see there are gains, so get them if they fit into your mod path.
Unabomber is offline   Reply With Quote
Old 08-04-2007, 06:05 PM   #18
kb2spn
Scooby Newbie
 
Member#: 28897
Join Date: Nov 2002
Chapter/Region: Tri-State
Location: Nanuet,NY
Vehicle:
2004 STOLEN WRX STI
Blue/Gold

Default

Quote:
Originally Posted by intpostman23 View Post
every time someone says read the stickies i think to myself... is this a forum or am i just reading info on a site... isn't a forum where people communicate with each other... who cares if the same question is asked... does it really bother people that much... if you spend your whole day looking at this site and really care that much about what people post i feel for you..
yeahhhhhhhhhhhhh
kb2spn is offline   Reply With Quote
Old 08-04-2007, 07:45 PM   #19
wrxfactor
Scooby Specialist
 
Member#: 49978
Join Date: Dec 2003
Chapter/Region: NESIC
Location: Shrewsbury, MA
Vehicle:
2002 WRX w/ JDM STi
6spd, EJ255, VF39 & EWG

Default

Quote:
Originally Posted by VRT Gump View Post
north American Subaru IMPREZA owners club of america. there are tons of posts about N/A subarus in here.

Yes, and they have their own forum. This is for 2.5L Turbo Powertrained Subarus. Do you want to tell the guys from Australia and Europe that they don't belong here because it says North American?

on a side note, I did see the headers sticky that I missed the first time. I have read a ton about this and have now learned to not ask any questions on nasioc as you always get flamed or "read the damn sticky"

You don't always get flamed. You get flamed when you deserve it 96% of the time. This time, you deserved it. You opened this thread assuming misinformation was correct, and didn't properly search. You should not have made the thread and you are deserving of the flaming you are and will receive.
On a side note, it's funny how all the noobs agree about NASIOC being a flame haven and complaining about searching.
wrxfactor is offline   Reply With Quote
Old 08-04-2007, 09:39 PM   #20
WOR440
Scooby Newbie
 
Member#: 106807
Join Date: Feb 2006
Chapter/Region: MAIC
Location: Hollidaysburg, PA
Vehicle:
---> 2011 EVO X

Default

I had good results with the gruppe-s unequal headers on my car with a bigger turbo. But it seems that EL headers will yield a bigger gain, but that they also cost more then my header.
WOR440 is offline   Reply With Quote
Old 08-04-2007, 10:41 PM   #21
STiAlain
Scooby Newbie
 
Member#: 134565
Join Date: Dec 2006
Chapter/Region: HIIC
Location: Oahu
Vehicle:
2006 STi
Black

Default

I would go equal length pnp and get it coated...my 2 cents
STiAlain is offline   Reply With Quote
Old 08-04-2007, 10:58 PM   #22
npower
Scooby Newbie
 
Member#: 152960
Join Date: Jul 2007
Chapter/Region: TXIC
Location: Plano
Vehicle:
07 STI
WR Blue

Default

Quote:
Originally Posted by wrxfactor View Post


It does get old, and it takes up space on the servers of the forever growing NASIOC. It's like some of you think that this massive operation that is over 150k members is simply a drop in the bucket for cost.

- Chris
Point taken had never considered that angle
npower is offline   Reply With Quote
Old 08-05-2007, 02:54 AM   #23
All4bSpinnin
Scooby Guru
 
Member#: 99102
Join Date: Oct 2005
Chapter/Region: South East
Location: Jax, FL
Vehicle:
08 Corvette Z06
problem Traction?

Default

Quote:
Originally Posted by atomicfire View Post
The JDM Spec-C has equal length headers stock from the factory.
^yup because its TWIN SCROLL!!
All4bSpinnin is offline   Reply With Quote
Old 08-06-2007, 02:23 AM   #24
VRT Gump
Scooby Newbie
 
Member#: 142698
Join Date: Mar 2007
Location: Monterey, CA
Vehicle:
2006 Subaru
Aspen White

Default

I have been flamed in pretty much every post I have put up. Some, like this one, I did not read everything before posting. My bad. Others, like you can put a 20g in a stock WRX TR and not change the injecors, I have proof from a very good shop you can. They run it in there car.

And one other thing, never tell me to shut up again. I dont care who you think you are, but you dont know me and dont disrespect me because you think your all high and mighty because you know more about a car than me.
VRT Gump is offline   Reply With Quote
Old 08-06-2007, 02:31 AM   #25
biba028
Scooby Newbie
 
Member#: 109331
Join Date: Mar 2006
Chapter/Region: BAIC
Location: YAY! Area
Vehicle:
2006 WRX TR
Steel Gray Hotness

Default

Quote:
Originally Posted by Unabomber View Post
Understand something here folks and this is not personal on anyone here, but I get this often, so listen up:

We have stickys for a reason. Why? Because the same question over and over and over and over and over gets damned boring.

In this case, even a blind man would have found the Header FAQ. Inside that thread are multiple examples of header gains. You'd honestly have to be damned blind not to see the gains in the FIRST POST of the Header FAQ.

We do not have JDM Subaru here and this certainly isnt the 2.5i forum, so you people need to quit trying to one up me with your factoids.

If you can't read the FAQs or don't want to and want to hold hands, sing Kumbaya, and "talk", please do so in the Newbies and FAQ forum. These forums are dedicated to engaged conversation about old topics with facts and new insight and new topics for discussion. Don't like it? Then I'll let this forum go to hell in a handbasket with 90% of the posts asking about swaybars and AccessPORTs and then see how you like it.

Then post all you rants in the OT section.. come on guys..!
biba028 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
Equal vs. Unequal length headers bcWRX-02 Newbies & FAQs 58 05-25-2009 04:29 AM
Unequal length headers on an I4 roksax Off-Topic 12 07-03-2007 11:47 PM
unequal length headers on an 06 sti dnaL0R Factory 2.5L Turbo Powertrain 27 10-01-2006 12:55 AM
Please compare equal vs. unequal length headers... shemoves Normally Aspirated with bolt-on Forced Induction Powertrain 6 09-02-2006 02:44 PM
Equal Vs Unequal length headers Onederer Factory 2.0L Turbo Powertrain 2 05-10-2002 02:13 AM


All times are GMT -4. The time now is 03:28 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.