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Old 02-10-2009, 10:24 PM   #1
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Unequal length headers

My buddy is a Subaru guy and we were talking about firing patterns of different engines (at this point I must be an addict) and I brought up that his STI sounded very V8 like and I assumed that it was due to the firing pattern but then he told me it was entirely manufactured due to the unequal length headers, and they are designed that way on purpose so they sound like a v8 instead of a wasp on crack.

1) is this true?
2) will this setup make a v6 mustang sound more aggressive?
3) Has anyone heard this in person on a v6?

I'll buy them tomorrow if anyone has ever heard of this for the v6
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Old 02-10-2009, 10:47 PM   #2
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Re: Unequal length headers

I don't believe anyone makes unequal length headers for a V6. It is an even firing engine however.
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Old 02-10-2009, 10:55 PM   #3
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Re: Unequal length headers

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I don't believe anyone makes unequal length headers for a V6. It is an even firing engine however.
I did find them for the older v6 at this site: V6 Mustang Stuff | V6 Mustang Performance Parts and Accessories , but I'm just not sure if they sound the way they do on a WRX
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Old 02-11-2009, 07:05 AM   #4
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Re: Unequal length headers

Mac and BBK makes them for the V6 I But there Shorties unequal length headers for a mustang V6

http://www.v6mustangstuff.com/Headers.htm
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Old 02-11-2009, 03:40 PM   #5
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Re: Unequal length headers

I have the BBK headers. It did improve the sound and power band. Headers alone wont make it sound like a GT
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Old 02-16-2009, 07:28 PM   #6
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Re: Unequal length headers

Subaru's are nice rides, however you think it sounds like a V8???? There is a clear distinction b/w a V8 and a 4 cylinder turbo boxer engine in my opinion.
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Old 02-18-2009, 05:04 PM   #7
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Re: Unequal length headers

The unequal headers make it sound like half of a v8, if that makes sense, it basically gives it the sound of the firing pattern that occurs on one side of the v8... I did a custom job over the weekend that lengthened one header and it definitely made it sound uneven but it also killed about 15 horsepower... I'm undoing it this next week, lol
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Old 02-18-2009, 09:03 PM   #8
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Re: Unequal length headers

Hmmmmm ^ not sure what that means but ok. I have MAC shorties, off road h-pipe and flomaster 40 series catback and it sounds good and its set up for the future if I plan on modding the motor/going with a supercharger set up. Very throaty sound at low rpm, however at 3500rpm and up you know its a V6.
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Old 02-18-2009, 09:09 PM   #9
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Re: Unequal length headers

the guys at the exhaust shop had no clue what I was doing either, they just did what I asked and it turned out to be a waste of time and money, lol. Next week I'm going true dual with flownaster 40s and side exhaust, that should sound decent
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Old 02-24-2009, 04:33 PM   #10
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Re: Unequal length headers

true dual flowmaster 40s does sound pretty decent on v6 mustangs but make sure its true dual with now crossover pipe. i used to have that setup on my v6 when i had it.
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Old 02-24-2009, 11:08 PM   #11
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Re: Unequal length headers

How the hell can STi sound like a V8? Not even close, not in a million years! If you want to get the best sound out of V6, all you need is MAC LTs, H pipe, flowmaster 40s.
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Old 02-25-2009, 08:18 AM   #12
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Re: Unequal length headers

the v6 sounds crappy because its an even fire engine (two cylinders one per side fire at the same time). Take an older viper v10. They sound horrible they are also even fire. This is not the only reason the v6 sounds bad, but one of the main ones. Someone a bit back was talkign about changing the firing pattern but no one ever really messed with it.
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Old 02-26-2009, 08:04 AM   #13
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Re: Unequal length headers

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Originally Posted by stangaroo View Post
The unequal headers make it sound like half of a v8, if that makes sense, it basically gives it the sound of the firing pattern that occurs on one side of the v8... I did a custom job over the weekend that lengthened one header and it definitely made it sound uneven but it also killed about 15 horsepower... I'm undoing it this next week, lol
Think of a trombone and that is equal length/unequal length engine banks. Trombone A is short pipe and that is one pitch. Extend the brass tube and that extra header length is now that pitch of air escaping is bank B. Add both notes together and harmony my muffler goes the horn.

Yes, you will lose HP the minute you throw a short curve to the air flow. I would remove said short note. Can you kind of see the air speed it takes to raise or lower the sound is speed out the tube? There you go is I think something like that.
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Old 02-26-2009, 08:58 AM   #14
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Re: Unequal length headers

I award you no point and may god have mercy on your soul for your answer. If I ever see the analogy of Mustang header is to Trombone on my board exam I'll thank you but I doubt it...LOL
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Old 02-26-2009, 10:35 AM   #15
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Re: Unequal length headers

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Originally Posted by PazUp View Post
Think of a trombone and that is equal length/unequal length engine banks. Trombone A is short pipe and that is one pitch. Extend the brass tube and that extra header length is now that pitch of air escaping is bank B. Add both notes together and harmony my muffler goes the horn.

Yes, you will lose HP the minute you throw a short curve to the air flow. I would remove said short note. Can you kind of see the air speed it takes to raise or lower the sound is speed out the tube? There you go is I think something like that.
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Unequal length headers are headers that are not bend up like the factory ones, some have larger tubes for more flow, but the main difference is that the unequals don't have all the factory bent tubes. The difference between unequals and equal length headers are on the equal length ones, each tube is exactly the same length, thats why it looks like a huge mess of tubing, but it gives you a little more power over the unequals, on a stock motor you probably won't notcie a difference between the two, but on an engine thats been modified somewhat you might notice a little more power.There is only about a 2-3 hp difference between the two headers and plus the spark plugs are a ***** to get at with equal lengh headers.
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