Unequal Length Headers vs Equal Length on a Twin Scroll Turbo Setup

[Niran]

Hey guys,

Been thinking about this for a while now, and have read up that this probably shouldn't be done. Nonetheless, wanted to know for sure from you guys and if there are any alternatives.

I've got a 2003 WRX STI (V8), which I am pretty sure is twin scroll, and am pretty sure has EL headers (sounds like an evo rather than an old school suby - No rumble as such). Before i knew much about subys, one of the main reasons for buying this was for the good old suby rumble that we all love. Now that I've owned my v8 and researched, I know why its non existent (exhaust pulses etc.). Anyway, I am wondering if i can get the best of both worlds by switching headers.

Will switching to UEL headers completely negate the positive benefits of twin scroll and possibly cause engine damage (or so I read - back pressure on one cylinder only etc.)?

Was thinking of something like this: http://www.rallysportdirect.com/fits/2004-subaru-impreza-wrx-sti-2-5/exhaust-headers-and-manifolds/tom-193082-tomei-expreme-unequal-length-exhaust-manifold

Is semi-tuned another alternative? I have heard the name floating around but haven't got any facts about positives and negatives, or even what it does. I'm guessing its half way between EUL and EL?

Any thoughts and experience on this would be appreciated.

[Marky]

So basically you just want the noise

Anything you do going to un-equal length will be less ideal than equal, just accept that and make your choice

So it's up to you if it's worth spending hundreds to go backwards (hundreds? over a thousand? I dunno)

Plenty of people spend thousands in search of the right look with no regard to practicality, so I say do what you want. I choose air filters based on the sort of sucky noise they make so I can't judge

Hell you could just swap the whole manifold and turbo setup to a VFwhatever and an old RS legacy exhaust manifold for ultimate old school boxer noise if you wanted

Maybe you should have listened when you bought it and gone "wait, that's not the noise I want" and not bought it

Personally I like the EL sound, the boxer noise is pretty bogan these days and EL sounds mint when it's doing loud boosty things

[Guest]

I have an old single scroll mani and up pipe. Straight swap for your headers/up pipe

[4G63B8]

I will swap my V7 STI for your STI Niran and you get the boxer sound for free lol...

[Niran]

 4G63B8 said:

I will swap my V7 STI for your STI Niran and you get the boxer sound for free lol...

Haha for sure man! +10k cash

[hunter951]

why would you remove twin scroll just for sound? the benefits of twin scroll are great...and they sound savage

[Andy_Mac]

Agree with Marky on EL, loving the dirty noises mine makes right now when giving it a good poke, and its still reliaviely quite and tame under 2 grand so don't feel like a dick driving round town

[Kiwi_Fozze]

My V11 with its last tune revision sounded savage as f**k on boost with the twinscroll

[Niran]

 kwi_fozze said:

My V11 with its last tune revision sounded savage as f**k on boost with the twinscroll

How did the tune change how it sounded? Forgive my ignorance

[Marky]

More advance makes things sound betterer, angrier

Until it makes that pingpingping noise anyway

[chulozumo]

I'll just throw it out there, coz I want a twinscroll setup and have EL 4-2-1 syms headers, a giant baffled sump and a low km no crack vf30.

I know it's unlikely but If you want to work something out just pm me

Edited March 8, 2016 by chulozumo

[ADIKT]

 chulozumo said:

I'll just throw it out there, coz I want a twinscroll setup and have EL 4-2-1 syms headers, a giant baffled sump and a low km no crack vf30.

I know it's unlikely but If you want to work something out just pm me

He wants rumble - something those headers wont give him

[chulozumo]

Yeah but these are way better then rumble, makes it sound like its on crack, as you already know throw in the rotational and you confuse everyone hahaha

[boon]

 chulozumo said:

Yeah but these are way better then rumble, makes it sound like its on crack, as you already know throw in the rotational and you confuse everyone hahaha

Stahhhhhp, nobody is going to be dumb enough to swap away a twinscroll setup for a SS just to get some noise.

[chulozumo]

Don't you have a car to raid at pick a part of something? Hahahaha Na I know, just throwing it out there

[Niran]

Hahaha yeah na not looking to swap out the twin scroll. Just trying to find out what header options there are to get that rumble, without sacrificing power

[hunter951]

 Niran said:

Hahaha yeah na not looking to swap out the twin scroll. Just trying to find out what header options there are to get that rumble, without sacrificing power

someone correct me if im wrong, but to run a twin scroll setup correctly you NEED equal length headers...

[loner]

Get some high lift cams and a free flowing exhaust to improve both the sound and the performance at the same time.

If you really want to sound like a boyracer, get a BOV.

Edited March 9, 2016 by loner

[chulozumo]

Zututututu +5 JDM points yo

[Niran]

 chulozumo said:

Zututututu +5 JDM points yo

Hahaha brilliant

Bought a recirc valve and removed intake silencer

[boon]

 hunter951 said:

someone correct me if im wrong, but to run a twin scroll setup correctly you NEED equal length headers...

Naw, it's more about valve overlap and split pulses than length. Length doesn't hurt though.