there are 2 different styles of headers avaliable off the self for a Magna im looking at. One design is from HM Headers and they were used on the AWD rally car. The other is the Race spec set from RPW.

i currently have something similar to the HM headers on my car which are incorperating the stock Ralliart manifolds and pacemaker brand from the headers to the cat.

The HM Headers
http://cgi.ebay.com.au/Mitsubishi-Magna-AWD-3-5L-V6-Headers-Extractors_W0QQitemZ190030615180QQihZ009QQcategory Z130631QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

RPW Race design[IMG]
http://www.rpw.com.au/shop/index.php?option=com_virtuemart&page=shop.browse&category_id=57&Itemid=31

i am currently gathering parts for a fraz more power than i currently have so which is better? Should i just keep what i have or are there gains to be had?

And best brand for a high flow cat?

cheers guys

RPW race spec.....the longer primaries are better

As for high flow cat...mebbe 'metal cat'...or any metallic cat (not ceramic).

Can i ask a dumb question, is there a difference between headers and extractors? And if not, what would be a problem in looking at pacemaker extractors cause arent they cheaper?

Other

Headers and extractors can be used interchangably....the US call them headers. There may be a technical slight difference but I forget what it is. If you ask for headers or extractors you'll get the same thing

Pacemaker are good for their price. I looked at 95% of the headers on the market, and for quality and bang for buck, ya cant really beat them....so thats what I got.

IMHO
I think extractors can cover primaries and secondaries where headers are usually primaries that may or may not have the secondaries included in one unit.

Headers are the exhaust pipes from the engine head(s) to the first interference junction ( first join to the other pipes ). You may then have a set of intermediate pipes from this junction to where they join to form the single exhaust or at the cat. These imtermediate pipes are the secondaries.

eg. An eight cylinder engine might have 2 sets of 4 engine pipes (headers) that join together and then go through two intermediate pipes (secondaries) and then join into one exhaust.
Commonly known as 4 into 2 into 1 or 4:2:1. The lengths of the headers and secondaries can be varied to give different power and torque curves.

A V6 engine might have headers with three exhaust pipes joining into one secondary and then the two secondaries from each side join into a single exhaust.

A 6 cylinder racing engine, may have 6 longer headers that join at one spot - known as 6 into 1 or 6:1. This configuration is usually good for power over about 4000rpm but not very good for torque. This configuration could more easily be called extractors as the primary and secondary pipes are combined in the single length of each exhaust pipe.

If you look on EBay, the extractors for sale are usually comprised of two parts - the shorter headers that bolt on to the secondaries that then bolt onto the cat.

I hope this makes sense and hasn't been too confusing. :think:

thanks for that, the piping configuration makes sense to me now. so having longer primaries and shorter secondaries would be better? im just trying to find out what to do for my exhaust, the sound is crap, sounds like a high pitched motorbike, so im thinking maybe a resonator, or changing the piping from 2 1/4 to 2 1/2, or investing in headers. which option is the best or should i bite the bullet and do all of it?

thanks for that, the piping configuration makes sense to me now. so having longer primaries and shorter secondaries would be better? im just trying to find out what to do for my exhaust, the sound is crap, sounds like a high pitched motorbike, so im thinking maybe a resonator, or changing the piping from 2 1/4 to 2 1/2, or investing in headers. which option is the best or should i bite the bullet and do all of it?
Do it all.

Jase: I doubt either of your options will be much different when installed on your car. If I were you I'd go for the cheapest of the two, or just get pacemakers.

Get the Hurricane race specs. Longer primaries and easy fit. The hm's are just so you can tell people that you've got headers. Whether they do any 'extracting' is another matter.

The alternative is to opt for a shorter length primary but go with a smaller diameter pipe. The hurricanes I read are 1.5/8" diameter, many other brand use 1.1/2". But don't compromise on equal length primaries. If they're not equal length then they're a waste of time. Extractors can't extract if 2 or more pulses arrive at the collector simulaneously.

If I didn't have the old man's muff shop resourses, the Hurricanes would be the one's I'd install. Or do what I did and make a set :cool:

i got xforce extractors for $750 fully stainless steel with 2x braided hose flex, price in cluded fitting, power improved ++++ and sound at the engine and through the exhaust is nice....

Anybody have the diameter of the exhaust ports at hand ?
Whatever that is is what the inside diameter of the primaries should be - same as matching intake diameter to the ports on the inlet side.

Anybody have the diameter of the exhaust ports at hand ?
Whatever that is is what the inside diameter of the primaries should be - same as matching intake diameter to the ports on the inlet side.

This isn't the case.

You need a larger diameter primary than exhaust port. This "step" works to extract the exhaust gases more effectively.

The exhaust port diameter is around 1 1/4". The pacemaker primary pipe is 1 1/2".

Not sure about the diameter of the stock exhaust manifold, but holding up the gasket to the exhaust ports reveals that the gasket is way bigger than the ports.

Will get some measurements this afternoon.

EDIT Included a pic and measurements from Pacemaker Website

The port size are like 1.5/8" aren't they?? Better put the micrometer into the port on monday. But definately need a smidgen larger initial entry into the headers than the port size. About 1-1.5mm is heaps. Just taper into the header diameter you want. For eg; if we were making a 1.1/2" primary set, we'd simply flare the pipe at the flange to get the desired diameter. Also, inserting the primary pipe into the flange plate and then welding will give you a much stronger header and longer life.

The most suitable for the Magna 3rd gen V6s is 1.1/2" (all purpose header) upto 1.5/8" for mid to high rpm improvements. Both designs will give gains but the primary pipe length in consideration of the pipe diameter is what you need to look at. No point using the 1.1/2" primaries on a drag car.


1.1/2" and short (<24") primaries = average low, ok mid, better top

1.1/2" and longer (>24") primaries = good low, best mid, ok top

1.5/8" and short (<24") primaries = average low, ok mid, best top

1.5/8" and longer (>24") primaries = ok low, best mid, good top


As you can see there's no point using the 1.1/2" primaries on a drag car, but they would make an excellent daily driver while remaining more compact than an equivalent performing larger diameter piped primary when used for daily driving.

I've run 1.5/8" at 29" primaries and gained big in the mid and top end. Low rpm was freer but not exciting. The same length primaries in 1.1/2" will give my AWD the low and mid boost it needs to get that big lump up and moving.


The other factor is the thickness of you wallet :P

cutting and pasting what i said in beefs ehaust journey thread..

-ok, now after reading that the hurricane headers are 1 5/8 and so are rpws, and also im sure somebody has said it before, im pretty sure they are the same headers..

now what will be interesting to know is what are the prices for hurricanes headers compared to rpw's 'race design' headers-

cutting and pasting what i said in beefs ehaust journey thread..

-ok, now after reading that the hurricane headers are 1 5/8 and so are rpws, and also im sure somebody has said it before, im pretty sure they are the same headers..

now what will be interesting to know is what are the prices for hurricanes headers compared to rpw's 'race design' headers-


Thread mine at all only 2 years old

-ok, now after reading that the hurricane headers are 1 5/8 and so are rpws, and also im sure somebody has said it before, im pretty sure they are the same headers..



I wouldn't have thought so, the RPW headers are actually made under contract by Liverpool Exhaust. Also from memory the hurricanes are press-bent, so the in real-world terms the diamater of the primaries is signifcantly smaller. If I am remembering wrong, someone please correct me.

i had this thread opened with a few others on headers doing some research and completely missed the date..