That's right, I've put it in to use as an example to show "nutcase" the extractors.

And it is a nice pic.

I see an like I'll find out the conversion and I can send you a cashieers check via fed x or ups or whom ever will get it there fastest just let me know the price plus shipping I am in the U.S. zip code 98664 that should be enough to get a shipping cost

Ummm extractors are really more the aftermarket ones...
From the factory they are called exhaust manifolds in Aus...
I believe at least...

The standard exhaust manifolds tend to go from four straight into one and at nasty angles too, so it chokes the engine a bit...

Yeah, i believe, they get the name extractors because the design of them usually causes a scavenging effect where the gases from one cylinder will "extract" gases from another cylinder rather than just letting them flow on their own. Thats just a VERY basic explanation, there is a lot of theory behind it.

All you need to know is they make your exhaust flow better

Also, I understand that generally, 4-1 extractors are better for top-end power, and 4-2-1 are better if you want more torque. Can someone correct me there?

OK blokes, here's the Dodgeman version

The cast iron thing that is usually found on stock engines with [usually] a single exhaust outlet point is widely known as an exhaust manifold.

In Australia, the aftermarket cast iron manifolds that were usually available for inline six's, such as Holden's but also for others like the side valve [flathead] Chryslers, were called headers, or cast headers. These were usually two separate 3 cylinder manifolds , each with their own separate outlet. Two pipes ran from them to join up as one, then on into the rest of the exhaust plumbing. Sometimes two pipes ran all the way to the rear for that extra racer effect.

The Generic term for the fabricated tubular exhaust manifolding in Australia is "Extractors" The plural refers to the multiple pipes, as well as the single assembly.
In the US, the same thing is refered to as "Headers" with the plural used for the same reason. Some of these systems are specificly designed to provide a superior scavenging effect at a specific RPM range & are known as "tuned length headers / extractors"
A common phrase, when refering to a single assembly is "a set of" headers / extractors, sort of like, a "pair of" scisors when refering to only one object.

This tuned length stuff is a black art that involves tuning the pipe diameter, the length of the pipes, & the arrangement of pipes in the firing sequence so that the sausages of gas from each cylinder all fit into a little "train", one behind the other, with no two of these sausages of gas crashing into the other at the point where they meet.
In a 4 into 1 system, the rearmost pipe is usually like a snake on heat with the contortions becoming less as we move to No.3 cyl & less again for No.2. These are "equal length" extractors / headers & the contortions are need to use up pipe length so that they are, in fact, equal in length.
The 4-2-1 system is also widely known as "tri Y" because there are three points where pipes meet forming three "Y" shapes.

I had a set of tri Y pipes made for my GX engine many years ago & they not only cleared the GX inlet manifold [the reason for the custom manufacture] but served me well on the street for many years.

It's my understanding that the collector is the point where, in the illustrated case, the four pipes join into one really big pipe. The collector often has a flange to allow the fitting of an extention pipe that is frequently necked down to the size of the first part of the exhaust system, or engine pipe, although the illustrated one obviously does not have this feature The flange allows the exhaust, or the first part of it, to be removed, for that wonderfull open header sound. Oh yeah, some think it helps performance when competing, but whatever the reason, it sure keeps little children away.

Thats always been my understanding of it.
Chris

seeing that in my engine bay would please me very much

Looks a lot like picture #195

ok i dont wana sound like a dumb ass but i probally will ive learnt what nearly every other part is but what is the extractors i never seem to ask this i no its it some thin to do with exaust is it the exaust system just a nother name this is a bit off the track but if any one has $15 come down to rose hill 4wd super show and have a look at all the stuff i work on the 4wd track every year so i no all the stuff thats there but its a good show this year but the track is small again like last year damb that silvia the organizer any ways just letin you know wat on its only on for this week that is from 28th till 4th of the next month

The extractors, are the start of the exhaust.
On this engine it is the four red pipes coming from the side of the engine that eventually merge into one to become the normal bit of the exhaust.
I cant see what type they are, but when people talk about 4-2-1 type extractors they mean it goes from 4 pipes to 2 pipes to one...

In the US we call the red things in the photo "headers". Meaning a tubular steel exhaust manifold. They can be short (as on a Ford) or long (as in the photo). If it's cast iron (as in most cars), we do not call them headers, but rather "exhaust manifold".

Is the same usage true of "extractors"?

In other countries they are called exhaust collectors.