4-2-1 extractors etc help

M

Matt

New Member
hey guys so im planning on getting my extractors done soon and i tried to look up the info on this site but couldnt really find much information im specifically after.
so i see there are diff options of extractors like 4-2-1 extractors, 4-3-1 extractors (i think?), i think theres more diff types but not 100% sure.

- So basically i need help in knowing whats the difference of 4-2-1/4-3-1/whatever others there are
- advantages/disadvantages of 4-2-1 over 4-3-1, etc or vice versa
- which type of extractor do you guys suggest for my 4g15
- and i know extractors increase power, but do they improve fuel mileage and sound?

LOL sorry if its abit overkill... any help would be greatly appreciated :D

thanks
 
The manifold designs are either 4-2-1 or 4-1 for four cylinder engines.

4-1 Manifolds are easier to tune to the specified RPM whilst 4-2-1 are more tricky to tune correctly.

I think for your application, any design would be fine as your power will increase and sound will change as well (Not to much compared to changing the rest of your exhaust system.)

Fuel economy may improve, but it would be marginal.


Incidentally it 4g15 stock exhaust manifold is a 4-2-1 design, just very short.
 
4-2-1 keeps torque available down lower... it is principally made for street applications.

4-1 is mainly for racing application.
 
Ahh ok if 4g15 have 4-2-1 extractors and i change to 4-2-1 extractors isnt that the same thing then? Like ita wont make any diff power wise? And sound wise?
Btw when u put in extractors, does the sound become deeper? Or just a cleaner sound?
 
i had X-force stainless steel extractors on my CE. they changed the sound of the exhaust abit. made it sound abit more "raspy" then a regular cat-back. but, it only sounded ok outside the car. inside the car all you could hear past 3000 revs was " tingy pingy" sounds from the stainless steel vibrating its a55 off under heavy acceleration.

gave like 1-2kw's difference? not much.
 
ohhhh ok thanks heaps unclepaulie, yeah josh i heard stainless steel isnt the best option to go with because of the tingly sound it makes but i dno man $300+ for a 1-2kw gain.. im not to sure if i wna do it now lmao
 
haha its only worth it if YOU think it is. if your strapped for cash or budgetting, dont do it.

take for instance my new VU. its got a 2.5inch cat-back and a Growler CAI( the same growler CAI made a 3kw difference at the wheels on my mechanics SV6. he dyno'ed it to see). it already sounds great, but iv only noticed a slight increase in throttle response. the only thing that i can say has made a BIG (and i mean BIG) difference is when i got my injectors cleaned, re-sealed, plenum chamber, throttle body and manifold cleaned out and re-sealed, sprak plugs and leads changed with a minor tune. THIS and only this has made a noticeable difference in power. and im not just saying this, it has given it a BIG boost of power that it just didnt have in it before.

that being said, i AM currently scopping out Pacemaker extractors + hi-flow cat prices/installs from exhaust shops. the main reason i wana do this is because its going to create a bit more power, (maybe 5ish kw's along with afew other mods im looking into, which will enhance the gains further) and i think its going to be worth doing.

normally doing 2-3 mods wont give you that much of a power increase. but if you pile up afew other mods ontop of and into that combo, it creates alot more power.

so if you are looking into some extractors, maybe get a hi-flow cat tied in with 2inch piping to a muffler n tip, as there is no point in having great flow going to bad flow, then back to good flow... its a waste of time. a whole system for a lancer is around 1.2k. thats how much mine was.

also maybe change your spark plugs n leads, even coil packs if you really want to. then check your injectors n maybe get them cleaned out, open up your intake manifold and give in there a BIG clean out. look into larger/ borred out throttle bodies as these arent THAT exspensive and can give you that little bit more "kick" when you first take off.
 
i couldnt be bothered reading all that, if i give the same answer im sorry

any extractors are better than the stock manifold, as the stock one on 4g15's combines the exhuast ports of non-syncronised cylinders (cylinders that dont fire at the same time)
this is quite bad for the high rpm power as u will already feel (it can push exhaust back into the next cyl to be fired which isnt damaging but just results in less fress air and fuel in the cyl to burn hence less power)

so basically any headers whether they be 4-2-1 or 4-1 will be a major top end power gift

i have 4-2-1 running right now, loveing them, they give mid range and great top end power and flow

i can imagine, 4-1 will give u a fair ammount more top end power, but will give u nothing in the mid and low end

honestly from what i have felt from 4-2-1 i would be sticking with them for street driving, but thats not to say u shouldnt try 4-1 if ur keen

if u need more info on 4-1 i suggest u contact "Henry" as he runs them on his 4g15 and he can give u what he feels about them, cos im biased to 4-2-1 cos thats what i got

also ppl say its only 1-2kws, but seriously on a 4g15 u will definitly feel the top end freed up alot, cos stock the manifold is so carp
 
unclepaulie said:
And changing the stock extractors for an aftermarket set of 4-2-1 extractors will not be the same thing as the aftermarket versions hav larger diameter tubes, larger radius bends, and smoother merge collectors. There is a whole lot more to them then just their 4-2-1 shape.
Click to expand...

Agreed... But your car probably only has a cast manifold...with many imperfections causing poor airflow.

A decent set of stainless 4-2-1 will make a decent-enough change to your throttle response, for all the reasons mentioned in UnclePaulie's quote.

CIMG0548.jpg


I am a convert. I think 4-1 extractors for a daily drive is overkill.

My 2c.
 
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