The only way to look at it as a restriction (referring to green car) is if your comparing them to extractors designed for upper rpm use, when extractors with narrow/long primaries will be a restriction up high.

But seeing as this is asking for low to midrange torque then extractors with (generally) thinner longer primaries will provide better results.

The stock headers for example are 'restrictive', but in no way beneficial to low-mid torque when compared to extractors designed for this.

Put some 3.7 diff geers in and that will fix the prob, unless you want to run pacemakers or difillipos or jmm headers you will never get anyone here to agree that your extractors affect low down torque because pacies are widely loved and noone has a bad word.
If you dont like the way your car feels then that is a good enough reason to change it to the way you like it i say.
In the days of double demerits and speed cameras who needs a rig that screams all the way to redline anyhow.
Good luck fixing the prob, probably easier to call up a decent zorst shop.

Are you trying to say you can't get extractors to perform better downlow than the stock manifold? You obviously don't know what you are talking about, and before you take this as a personal insult remember you have suggested a) to fit restrictive system (a very general and naive statement)and b) to fit 3.7 diff gears in a thread about headers.

The brands above would be given as recommendations as they are generally regarded as the best 'off the shelf' header system for falcons and among the only mandrel bent options. I can see where you're coming from with many one eyed visions based on brand name, but these systems do work for their designated purposes. Obviously a custom set of headers will flow better in whatever part of the rev range they are designed for, but how many people know enough about header design to build or trust an exhaust place to build what you want?

Yes i am saying that my car had more lowdown torque with the stock manifold,i never said it didnt gain mid and high range with the extractors i just said it had better low down torque.
Yes i am a mechanic and understand how a motor works.
You obviously misundertstood what i said, i never said the standard manifold was better thean headers i said to get a restrictive set of headers and it would have more low down torque than the set of pacies being currently used.
My understanding is that more lowdown torque is wanted, i never saw mid range or top end performance even mentioned in this thread by the thread starter.
Any engine builder will tell you if you want bottom end, you must sacrifice top end power.
I think you guys dont like what i am saying so you are trying to pick my theory to bits because i go against the grain.
If the guy wants to live life at under 2500rpm then there must be some sort of backpressure-restriction to keep that low down grunt alive, i didnt even notice the difference my extractors made until i was doing at least 3000-3500rpm and that is too late in this instance.
Low down, not midrange, not top end. low down.

installing 3.7:1 diff gears doesn't achieve the same thing. all it does is make the engine rev higher for a given road speed.
and it certainly won't fix the problem.

How can having a car accelerating faster off the mark not help help with a lack of low down power, it compensates for it obviously because the car in question isnt pokey enough down low.
Im done now at flogging this dead horse, so much for being able to think out of the square- bloody hypocrits.
Now i want a ten page essay on how diff gears wont make a car more enjoyable-pokey under 2500 rpm.
Have a nice day

Do you come standard with a brickwall?
because beating myself to death on it would be easier then trying to explain this to you.

You're a mechanic. SO WHAT. A RESTRICTIVE SYSTEM OF THE WRONG DESIGN WONT WORK. RESTRICTION IS NOT THE AIM.


There mey well be some restriction in the system, thats not the argument.
My problem with what are saying is you make no mention of what it takes to design a set of extractors the help low rpm torque. that being the correct pipe lengths and pipe sizes that complement that length for the desired result.

The next point is, a well designed extractor for low rpm power would still at least equal the top end power of the stock manifold.

Firstly, backpressure creating low down torque or grunt as it has been so eloquently put is a myth aka s**t.

The stock manifold is a piece of s**t, period. Obviously you had a set of headers designed for mid to upper rpm use, however this would still have negligable difference down low unless it had obscenely large primaries.

If you want low down torque, then get a set of extractors designed for low down torque as has been said atleast half a dozen times in this thread. They will s**t all over the factory manifold down low and most likely throughout the rev range too.

You don't design extractors to be restrictive, as has been said probably 5 or 6 times now in this thread restricion at higher rpm is a by product of getting extractors designed for low rpm's. When designing a system you don't go out and try and design a restrictive sytem, its designed as a best trade off between exhaust flow within and outside of the desired maximum torque rev range

As tickford said earlier, if using an off the shelf system look for a system with the narrowest and longest primaries but still with mandrel bends.

no one said changing diff gears wont make it 'pocky' off the mark.

it's that changing the diff gears brings on a whole bunch of new problems.

the question about extractors. how is posting about diff gears answering the question?


nothing you have posted has helped anyone. all you've done is help make people dumber

I like it when people who have a clue make posts.

Dunno if its been mentioned, but both are press bent exhausts.

haha, not that you hadn't said pretty much the same thing in this thread and the five others going around at the moment.

Contemplating making a sticky about this kinda thing, but then again the sticky's never seem to get looked at anyway. That and by the time most people get past the second line they won't wanna read on unless is says "this is the right header for you"

http://www.headerdesign.com/ if it was me i would be looking at this and then pick i have not read all this thread sorry if it already have been answered

I know this is old but i thought id update it just in case i can help anyone as i spoke to my exhaust shop and its true that using a 38mm primary will work best for low end power and torque and apparently press bent helps with torque.

So extractors with 38mm primary are made by Wildcat, Hi tech and this dude on ebay http://cgi.ebay.com.au/FORD-EA-EL-AU-BA ... 7C294%3A50

Now for pacemaker 4499 equvilent/copy is another dude on ebay and has his own website and there practically the same and u save urself over $100.00 when buying his

http://www.dkne.com.au/ford-falcon-6cyl ... p-235.html

wildcats are renowned for their torque band down low. they will strangle you up top more than a set of pacemakers, but still flow better than the factory manifold.

a set of diff gears (3.45 or higher) will give you more of a torque feel though, as the long first and second coupled with a 3.08 stock diff is what makes it struggle down low.