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Headers?

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Butler7508

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Has anyone done headers on their 6.4 and if so, can you give me your feedback? Did you pick up any power and did you notice a difference in fuel economy? Did you tune after installing the headers? It doesn't seem like a very popular mod or at least I haven't read many posts on it so I am wondering if its because of a lack of gains.....
Any feedback would be greatly appreciated
 
The best thing headers can do for the 6.4 TRUCK engine is help alleviate the broken manifold bolt syndrome. Shorties are a good replacement for the manifolds just due to less hassle on hookup to stock pipes.
Hi-flow cats are nice and nothing beats a set of long tubes when really trying to eek out all the horse-torques (A Cletus phrase).
ARH makes the best and priciest long tubes, but many others make shorties that all perform about the same.

I'll go shorties when the time comes with a broken manifold bolt. Can't see paying $2k for a set of long tubes on a work truck.
 
From a lot of reading I've done, there is no such thing as high flow cats.
While they may say it in their advertising, ask them to show you the numbers in real life of how much extra they flow. ;)

As far as headers go, it's all about design. Tube size and length are the major issues. Long tubs will help promote torque.

But you also need a good intake system, and a tune that can accommodate the extra air flow thru the Air Pump "engine" ;)

here's some real world info for you. Had 2 exact same Harleys. One had a true dual exhaust. The other had a 2 into 1 exhaust. The true dual made more torque. The 2 into 1 mad more horsepower. ;)
 
headers are a complementary item.

we've pushed major horse torques through kooks green cats.
 
Crusty old shellback said:
From a lot of reading I've done, there is no such thing as high flow cats.
While they may say it in their advertising, ask them to show you the numbers in real life of how much extra they flow. ;)

As far as headers go, it's all about design. Tube size and length are the major issues. Long tubs will help promote torque.

But you also need a good intake system, and a tune that can accommodate the extra air flow thru the Air Pump "engine" ;)

here's some real world info for you. Had 2 exact same Harleys. One had a true dual exhaust. The other had a 2 into 1 exhaust. The true dual made more torque. The 2 into 1 mad more horsepower. ;)
Click to expand...

While some of the hi-flo cats out there are a gimmick I can assure you there are real "hi-flo" cats available. The two companies that come to mind are American Racing Headers and Kooks. Their cats flow so good that your vehicle will likely trigger a cat inefficiency code due to them flowing so well. They literally flow so good the pre and post cat sensors cannot see a difference in flow triggering the engine light.

Old school logic was you want short tube headers for torque and long tube headers for top end power..... not true in todays moderns engines. If you are considering any type of headers you should ONLY consider Longtubes, they will simply outperform your stock manifolds and shorty headers all throughout the power band....... more power and torque everywhere. Your biggest power gains will come in the upper RPM band but you will see gains everywhere. Generally speaking you should not need a tune for longtube headers. In some cases the o2s are placed further upstream or downstream so a tune may be needed to optimize power. Also, cant beat the sound of a V-8 with a good set of headers on it :).
 
I want some crossover headers so my Hemi can sound like a Ferrari.
 
ClawSS said:
The best thing headers can do for the 6.4 TRUCK engine is help alleviate the broken manifold bolt syndrome. Shorties are a good replacement for the manifolds just due to less hassle on hookup to stock pipes.
Hi-flow cats are nice and nothing beats a set of long tubes when really trying to eek out all the horse-torques (A Cletus phrase).
ARH makes the best and priciest long tubes, but many others make shorties that all perform about the same.

I'll go shorties when the time comes with a broken manifold bolt. Can't see paying $2k for a set of long tubes on a work truck.
Click to expand...
I just typed Hemi brok.. and google filled in the rest but all the hits were 5.7L/6.1L

what’s the story on broken manifold bolts?
 
Rockcrawlerdude said:
I just typed Hemi brok.. and google filled in the rest but all the hits were 5.7L/6.1L

what’s the story on broken manifold bolts?
Click to expand...
Its just a common failure - excess heat warps the manifolds and it snaps the studs/nuts off requiring removal of the manifold to fix. Been a problem from the 5.7 all the way up to the 6.4. Usually the first tell tale sign is the rear stud will break and since it doubles as the attaching stud for the rear of the manifold heatshield you'll notice the heatshield just flopping there. Then a tick on cold start. Then a tick all the time.

The theory is an exhaust system and header setup will outflow the stock setup and therefore not accumulate and store as much heat - usually headers have a much thicker flange which resists warping too.

I'm not convinced though and unless its a seriously nice header I've seen plenty just crack at their welds instead... Hemi studs (on the trucks at least) aren't all that difficult to extract anyway.
 
jsalbre said:
You can "fake" it with fancy crossover headers that move the exhaust from some cylinders to the opposite side. It's weird, but it works.
Click to expand...
www.swartzgarage.com

180-Degree Crossover Exhaust — Swartz Garage

There’s nothing wrong with the grumble of an American V8. I have a cobra with a 427 side-oiler, Webber carbs and side pipes. It sounds bad ass and I love it, but I want to do something a little different for the SL-C. I considered doing a 180-degree crossover exhaust, but there is no room to do it u
www.swartzgarage.com www.swartzgarage.com
 
i just bought a 2014 6.4 2500 4x4 guy i bought from put on long tube headers with 4" true duals out the rear bumper
no cats or mufflers,,,,,less than 1 yr ago
i want to take off and go back to manifolds as is going to be used as a boat tow truck
so if any1 interested in the headers and pipes lmk as want the factory cat midpipes off urs
as will do high flow from cats back
 
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