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View Full Version : Man-A-Fre knocked it out!


Rezarf
10-10-2011, 09:36 AM
I installed my Man-a-fre 6 into 1 headers yesterday to replace a badly rusted set. I was dreading the install after installing the first set years ago. The older set required sourcing a washer of the correct size and thickness, then cutting it in half, to make up the difference between the header and the intake manifold thickness difference. I think it was the source of so many leaky headers.

Well, MAF must have changed their design because the new headers bolted right up with absolute precision to the intake manifold bolt flanges. I was super impressed and watched my Fel-Pro gasket seat perfectly as I tightened down the nut to the right torque. Best part is the jig for the MAF headers must not have changed as I was able to wiggle my existing exhaust into place and it bolted right up... that was a treat.

I took Ricardo's recommnedation to use Prestine Powder Coating in Denver. The owner is a one man shop and he does NICE work. I sprung for the fancy turbo exhaust coating that has ceramic inside and out and the guy glass beaded the exterior then laid on a flawless coat of the satin powder coat. I was tempted to go for the silver, but he said the performance of the black was worth coating it in black in his opinion. Both were the same price...

I have about as much in the coating as the headers but I don't want to do this job again anytime soon.

Below, you will see my weld "repair" slash JB weld treatment to see if I could save the old headers... not a chance (don't judge me ;) ). Then the new headers and fancy coating, and lastly the flange mating surface that should maintain a nice tight seal without the half-moon washers.

2nd Childhood
10-10-2011, 07:14 PM
Does the performance of the 2F increase significantly with the header? I have thought about the addition of the header but I do not know how much improvement it may make. Is there any problem passing emissions on your rig? Mine is a 78 and I don't know how good the people are trained at the emission testing stations, or if it is all legal to alter from stock.
The header sure does look good. Best of luck with the product.

Rezarf
10-10-2011, 09:41 PM
I doubt there is any real performance upgrade to be had. However, my original 2f came with a header and I have never driven my rig without one. I did pull all my emission stuff off my rig and passed without a visual inspection.

Most of the factory exhaust manifolds cracked... mine was there when I got it.

I do think the rig sounds different with the exhaust all fitted up... I couldn't get over how much quieter it runs with it all sealed up. I mean, I made my wife ride around in it tonight- just to impress her.

Thanks for the kind words.

RicardoJM
10-11-2011, 07:03 AM
Drew, those headers look downright nice! It is an expensive (relatively speaking) cost to get them coated; but it will keep temperatures down in the engine compartment and extend the life of the headers. The ones in the Bronco still look new as the day they were installed and the one in my FJ40 has a year on it and is still looking good.

subzali
10-11-2011, 07:20 AM
Does the performance of the 2F increase significantly with the header? I have thought about the addition of the header but I do not know how much improvement it may make. Is there any problem passing emissions on your rig? Mine is a 78 and I don't know how good the people are trained at the emission testing stations, or if it is all legal to alter from stock.
The header sure does look good. Best of luck with the product.

There are different headers available, and opinions vary on header performance effects. Check out this website (scroll down for headers) for some thoughts:
http://www.marksoffroad.net/FAQ.html

And here:
http://www.man-a-fre.com/technical_info/howheaderswork.htm

There are three basic types of headers for Land Cruisers: 6 into 1 (like pictured above), Tri-Y (also known as 3-2-1), and tuned. The factory manifold has all the exhaust gas making sharp bends and then clashing together to turn down into the tailpipe. Any header is basically trying to avoid that, and attempt to "tune" the exhaust for a specific operating range, typically low rpm (torquey) or high rpm (horsepower). I think it would be interesting to swap all 3 designs above onto the same vehicle in a short period of time and test them out, and see which one does exactly what.

Here are some pictures of the 3 styles:
6 into 1 (MAF):
http://www.man-a-fre.com/pa3/images/CAXK6LT3.jpg

Tri-Y (Marks Offroad):
http://www.marksoffroad.net/1specials/TriY-Header.jpg

Tri-Y (SOR):
http://www.sor.com/shared/image/325-10-big.jpg

Tuned (MAF):
http://www.man-a-fre.com/parts_accessories/alphabet/17100-40STINSTALLED.jpg

Tuned (SOR):
http://www.sor.com/shared/image/324-700_i-big.jpg

Personally I like the idea of the tuned headers, because the theory of their design makes sense, and they can be emissions compatible. Remember that technically it's illegal to alter or remove emissions equipment.

Rezarf
10-11-2011, 06:08 PM
I thought tuned meant they have created equal header tube length before the collector. Either way, I love the new headers I have on the cruiser and can't get over how quiet the rig is now.