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Old 11-07-2005, 11:00 AM   #1
boxerT
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Default '06 STi equal length headers

I read somewhere that the '06 STi has equal length headers which makes me assume the '04 and '05 do not. Are there any other parts in the exhaust system that are different or is everything else the same. Would the '06 headers be interchangable with the earlier STi models? Thanks.

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Old 11-07-2005, 11:35 AM   #2
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IByoupostedinthewrongforum
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Old 11-07-2005, 01:42 PM   #3
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I've got equal length factory headers on my 1991 RS-RA STi engine...
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Old 11-07-2005, 03:11 PM   #4
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mine should be here today!!!!
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Old 11-07-2005, 08:32 PM   #5
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06 WRX also have equal lenghts from factory
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Old 11-07-2005, 09:06 PM   #6
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where did you read this? I don't think they come with equal length headers.....
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Old 11-07-2005, 11:16 PM   #7
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thats what i heard from someone on here...when i got the car first.....and i read it somewhere else too
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Old 11-08-2005, 01:46 AM   #8
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Quote:
Originally Posted by boxerT
I read somewhere that the '06 STi has equal length headers
You read an incorrect rumor.

Quote:
Originally Posted by 06WRXTR
06 WRX also have equal lenghts from factory
No, it does not. Since you apparently own one, you'd think maybe you would look under your car and see the obvious.
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Old 11-08-2005, 12:38 PM   #9
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Quote:
Originally Posted by Matt Monson
I've got equal length factory headers on my 1991 RS-RA STi engine...

bzzt you have an equal length drivers side collector ... way differnt than equal length headders ..

i also have an equal length driver side collector on my non RS-RA engine


-j(cranky-need-more-coffee)
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Old 11-08-2005, 05:35 PM   #10
Matt Monson
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Hey cranky need more coffee,
I have both sides equal length. my other header pipe looks nothing like your lower one. I think your engine got built on a Monday. No more sake for the mechanics...
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Old 11-08-2005, 06:10 PM   #11
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the only impreza with equal length headers would be the non-turbo 2.5i


The wrx and STI share the same headers as previous years...
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Old 11-08-2005, 06:33 PM   #12
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The only STi's that have equal length headers are the twinscroll Ver 8's.
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Old 11-08-2005, 08:09 PM   #13
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^^^i agree
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Old 11-08-2005, 08:21 PM   #14
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Yeah Jaxx I saw Matts and only one looks like yours, I am hoping mine come like matts and not yours.

r12rex..... just....no
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Old 11-08-2005, 09:41 PM   #15
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100% correct the only equal length header belongs to the JDM cars that use the twinscroll setup....this completely gets rid of the boxer rumble due to the equal flow of the exhaust from both sides of the engine

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Old 11-08-2005, 11:59 PM   #16
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this is a USDM sti oil pan.

if the usdm 06 sti doesnt have equal length headers, why would the oil pan look like this? i am not one to tell you what the stock headers look like, but that oilpan is notched for headers like that.

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Old 11-09-2005, 02:01 AM   #17
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whoa.
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Old 11-09-2005, 02:07 AM   #18
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Quote:
Originally Posted by jared nelson
this is a USDM sti oil pan.

if the usdm 06 sti doesnt have equal length headers, why would the oil pan look like this? i am not one to tell you what the stock headers look like, but that oilpan is notched for headers like that.

Yes, the USDM STi does have a twinscroll-compatible oilpan. But it still has the IDENTICAL exhaust manifold to the turbo WRX I bought in 2001. i.e. UNequal length, and by a big margin. The header in that picture is the APS equal length header.
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Old 11-09-2005, 02:49 AM   #19
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JDM twinscroll STI's = equal length headers
all USDM WRX/STI's = non-equal length headers

done
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Old 11-09-2005, 04:10 AM   #20
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Quote:
Originally Posted by Matt Monson
Hey cranky need more coffee,
I have both sides equal length. my other header pipe looks nothing like your lower one. I think your engine got built on a Monday. No more sake for the mechanics...
Hey Matt,
Other versions, (N/A), with equal lengths were many, the one I remember best is the Impreza 'Sti-SRX', this thing was out of Japan in 93, had dual equal length primaries, back the G box C/Member, then it collected at the Ext housing seal. Variable cam timing on Inlet only, Variable intake manifold Runner length.
And I $hit you not, this thing hauled ass!!(for what it was. ..)

Cheers,
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Old 11-11-2005, 04:10 PM   #21
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I recieved mine and they look like those that Jaxx posted. Do you have a pic of yours MAtt?
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Old 11-12-2005, 07:44 PM   #22
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http://www.autoweek.com/article.cms?articleId=103062

"The STI’s four-cylinder still offers 300 hp and 300 lb-ft of torque, but gets a new tuned exhaust (as does the WRX) with all four equal-length pipes expelling gas out of the combustion chambers. The system improves low- and mid-range torque—not to mention the throaty sound the exhaust emits."

Unless Autoweek does not know what they are talking about, looks like Subaru might be setting up for a twin scroll turbo upgrade for the 2007 STi since equal length is more ideal for twin scroll setups (for spool up / simultaneous exhaust gas pulses on the turbine wheel through the twin scroll turbine housing manifold.

Hmmmm....interesting.

Last edited by DTECH-WRX; 11-12-2005 at 10:35 PM.
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Old 11-12-2005, 10:12 PM   #23
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I would take answer B. Autoweek doesn't know what they are talking about.
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Old 11-12-2005, 10:39 PM   #24
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Quote:
Originally Posted by DTECH-WRX
http://www.autoweek.com/article.cms?articleId=103062

"The STI’s four-cylinder still offers 300 hp and 300 lb-ft of torque, but gets a new tuned exhaust (as does the WRX) with all four equal-length pipes expelling gas out of the combustion chambers. The system improves low- and mid-range torque—not to mention the throaty sound the exhaust emits."

Unless Autoweek does not know what they are talking about, looks like Subaru might be setting up for a twin scroll turbo upgrade for the 2007 STi since equal length is more ideal for twin scroll setups (for spool up / simultaneous exhasut gas pulses on the turbine wheel through the twin scroll turbine housing manifold.

Hmmmm....interesting.
Hey Bud,
I thought the Twin Scroll Turbo was different to the 'Dual Housing/Twin Influx/Dual Exh' Turbo in that the Compressor wheel Has every serond blade shorter than the next as the first blade creates that much turbulance that the trailing blade at full length is only 50% effecient, therefore they cut away the 'ineffecient' part of the blade, reducing rotating mass, decreasing turbo response, (spool up), times, and decreasing charge air temps. Whereas the 'Dual Housing turbo is just that, they seperate the exhaust 'inlet' to make greater use of the exh 'pulses' from the Eng, this setup is particularly effective on Eng's that have the Turbo basically bolted 'real close' to the Exh ports.

Not sure though...

Cheers,

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Old 11-13-2005, 07:46 PM   #25
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Quote:
Originally Posted by silver arrow
I would take answer B. Autoweek doesn't know what they are talking about.

but i dont know where they were getting that.
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