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08-19-2008, 06:55 PM | #301 |
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Vehicle:2008 Impreza 2.5i dark M. Gray |
Stock headers until 06 where UEL. 06 and up have EL.
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08-19-2008, 09:22 PM | #302 |
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are you sure? I have a 98 and mine are EL
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08-19-2008, 11:48 PM | #303 |
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Yup I'm pretty sure of it. Did you buy the car used or new? Because I remember seeing a thread on the RS25 forums where people were getting OEM and JDM EL headers for their GC's for a cheap performance gain.
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08-20-2008, 12:29 AM | #304 |
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Yup Im sure. And why do you think yours are EL
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08-20-2008, 08:52 AM | #305 |
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Location: Merrimack, NH
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As far as I know (and it appears to be the case visually), my '99 EJ22 Impreza came with equal length headers. I've read it several times as well. The unequal length headers have the burbling sound to them as the pressure waves from the combustions collide at the collector, which mine has never had.
-N |
08-20-2008, 02:24 PM | #306 | |
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Quote:
Nope. Yours did not have equal length exhaust manifolds. Unequal length headers make noises that yours don't because they are headers and because they are also a different pattern of unequal length pipes. |
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08-20-2008, 02:50 PM | #307 | |
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Quote:
And next time I'm under there, I'll take a measuring tape to the pipes to see if they are equal length. They may not be ideally shaped, but they sure do appear EL to me. There's an extra kink added into the "shorter" side explicitly to even out the lengths. -N |
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08-20-2008, 02:56 PM | #308 |
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Aren't manifolds usually cast whereas headers are of tubular steel construction?
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08-20-2008, 02:57 PM | #309 | |
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Though I would be very interested to see how an engineer would manage to get both banks of cylinders on a flat 4 joining up right after leaving the engine. I'm just saying... |
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08-20-2008, 02:58 PM | #310 |
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08-20-2008, 03:02 PM | #311 | |
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Wiki sez: "Exhaust manifolds are generally simple cast iron units which collect engine exhaust and deliver it to the exhaust pipe. For many engines after market high performance exhaust headers (also known as extractors in Australia) are available. These headers consist of individual primary tubes for each cylinder, which then usually converege into one tube called a collector." In my exposure, exhaust manifolds don't have collectors. They have "merges", where there is not as careful a design as to the angle, diameter, and length of the merge. Headers have specially designed collectors that are meant to give the least flow resistance while allowing proper scavenging. Aaron |
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08-20-2008, 03:02 PM | #312 |
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I've said it before, I've always thought it was strange that people classified the pre-06 headers as "unequal length". The dual port ones basically have no primary tubing - the primaries are maybe 4 or 5 inches long. The difference in lengths of the secondary tubing can't be more than a couple inches, probably a 5-10% difference. For OEM exhaust, that's pretty good.
When I think unequal length, I think of my old Mustang shorty headers. Here's what the stock ones look like: (Hopefully that image pops up, I can't actually see it here at work.) Note that the front primaries are twice as long as the rears. Compare the stock Subaru header to a Borla header and that's unequal length. The primaries look to be roughly the same, but clearly the secondaries are waaaay different - one side is about 3x as long as the other. (Thank you for the picture, Xcceleration.com). Pat Olsen Last edited by Patrick Olsen; 08-21-2008 at 11:39 PM. |
08-20-2008, 04:37 PM | #313 |
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Thats the exact same as I have except mine is single port and yes it's EL beacuse I sound like a honduh
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08-20-2008, 07:23 PM | #314 |
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Read his post. If I understand corrctly, he is sayig they are UEL because there is a few inches of a difference. So if those are the ones you have, they are UEL.
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08-20-2008, 09:42 PM | #315 |
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yea well those "few inches" dont give any boxer rumble to my exhaust. They are EL.
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08-20-2008, 09:55 PM | #316 | |
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Quote:
Also, the Burns engineering company calls their collectors "merge collectors" and the rest of the industry seems to refer to the Burns style collector as a "merge collector"... of which a careful design and some serious fabrication go into making a supremely efficient use of exhaust gasses. If anything isnt an "exhaust manifold" its a set of headers made by Burns with their collector design. for our engines, only TWE uses such a design in their product. (that I know of) I think you guys are giving this use of nomenclature too much thought. I would bet a mojority use of the word "headers" in aftermarket engine parts is marketing. If there is no quantified definition for what are headers and what is an exhaust manifold, then who really cares which word is used to describe? Last edited by GrundleJuice; 08-20-2008 at 10:00 PM. |
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08-20-2008, 10:18 PM | #317 | ||
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Quote:
Quote:
Pat Last edited by Patrick Olsen; 08-21-2008 at 11:35 AM. |
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08-20-2008, 10:22 PM | #318 |
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08-20-2008, 11:55 PM | #319 |
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08-21-2008, 12:04 AM | #320 | |
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08-21-2008, 08:37 AM | #321 | |
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Quote:
The stock headers on mine are equal length (I will measure to confirm) and are made from steel tubing as oppose to cast iron and don't have all exhaust ports just dumping into a massive collector like an exhaust manifold. I would say that a 4-cylinder boxer can't really have a typical exhaust manifold, as you so keenly pointed out, though the new Subaru exhausts that curl around the front of the engine for emissions stuff seem to be Subaru's attempt at getting them to behave more like manifolds. -N |
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08-21-2008, 10:34 AM | #322 |
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I told you there were plenty of people who wanted to discussion the minutae with you. You can direct all further comments in their general direction...
But for the record, claiming that a length difference of several inches still qualifies as equal length is ridiculous. |
08-21-2008, 12:10 PM | #323 |
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So what is the difference in length? Has anyone ever actually measured? I just don't think the difference is enough to be worth worrying about.
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08-21-2008, 01:36 PM | #324 |
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08-21-2008, 01:53 PM | #325 | |
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Quote:
-N |
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