Header test

Wild one · Sep 3, 2022

For the guys claiming headers don't add anything,this test might be worth taking the time to read.

How Much Power Do Headers Add to a 5.7 Hemi?

We compare cast-iron exhaust manifolds to long-tube headers on a 5.7-Liter Hemi on the engine dyno at Westech.

www.motortrend.com

James OBrien · Sep 4, 2022

Good stuff. I think that's a pre-eagle head engine too?

Wild one · Sep 4, 2022

James OBrien said:
Good stuff. I think that's a pre-eagle head engine too?

By the look of the timing chain,i'd agree James. An 09 and up 5.7 would gain even more from a set of long tubes. Back when my truck was basically stock with just a Diablo 93 octane tune it ran a best of 14.18 (at the time it had a Magnaflow catback and Air Raid Cai ),putting a set of 1.87" JBA long tubes on it,and doing a custom HP tune took 6/10's off it's times .With just a set long tubes and a decent tune the truck went from 14.1's/14.2's to high 13.40's at 3600 ft . Bang for buck the only thing that beats a set of long tubes and good tune on the trucks is nitrous,lol

crazykid1994 · Sep 4, 2022

I’d love to see some different brands head to head on a newer eagle 5.7. They mention the 1-7/8 primaries were longer than their similar 1-5/8 primaries which aids in the torque curve being higher at lower rpm’s. By looks the arh ram headers have longer primaries over all others. Stainless works is close. Kooks is more of a mid length header and offers a 2” primary as well which would be great on a high hp boost engine. Jba doesn’t offer their long tubes and y pipe anymore so can’t really comment on theirs.

Burn2k12Ram · Sep 4, 2022

Had no idea LT's and a tune could be such a difference. Thanks for the article, was a great read

Wild one · Sep 4, 2022

Looks like AFE now has shorties for the 2500 guys with the 6.4.I'm not a fan of shorties,but they're a slight improvement over the stock manifolds. There's a few guys who want just a set of shorties to replace their stock manifolds but don't want a tune.or the hassle of messing with their cats , it looks like these'll fit their 2500/3500's.

Twisted Steel 304 Stainless Steel Short Tube Header

Performance Gains: This system produced gains of up to +11 HP and +19 lbs. x Ft. TQ., as measured on our in-house dyno. 1-7/8 IN - 2-1/4 IN 304 Stainless Steel Construction: This system is constructed of 1-7/8 IN - 2-1/4 IN mandrel-bent 304 stainless steel tubing for maximum strength and...

afepower.com

Wild one · Sep 4, 2022

crazykid1994 said:
I’d love to see some different brands head to head on a newer eagle 5.7. They mention the 1-7/8 primaries were longer than their similar 1-5/8 primaries which aids in the torque curve being higher at lower rpm’s. By looks the arh ram headers have longer primaries over all others. Stainless works is close. Kooks is more of a mid length header and offers a 2” primary as well which would be great on a high hp boost engine. Jba doesn’t offer their long tubes and y pipe anymore so can’t really comment on theirs.

Both SW's and ARH's long tubes have a pretty good rep,the differance between them,would come down to which set you can get your hands on these days. Both will rock your boat for cost though,they're great wallet lighteners

Honestly i doubt the average guy would notice any differance between the SW's and ARH's as far as power goes.

Wild one · Sep 4, 2022

Burn2k12Ram said:
Had no idea LT's and a tune could be such a difference. Thanks for the article, was a great read

Combine a good set of long tubes with a 6.4 truck intake manifold and tune for them,and your truck will act like a totally differant truck . The 6.4 intake manifold helps generate more off idle torque with it's longer intake runners ,combined with the long tubes longer primaries ,there's a noticable differance in off idle tire spin :Big Laugh:

Burn2k12Ram · Sep 4, 2022

Wild one said:
Combine a good set of long tubes with a 6.4 truck intake manifold and tune for them,and your truck will act like a totally differant truck . The 6.4 intake manifold helps generate more off idle torque with it's longer intake runners ,combined with the long tubes longer primaries ,there's a noticable differance in off idle tire spin

No doubt if I am going for performance with my Ram I would go with the EcoDiesel Lower AirBox mod, 6.4 Intake, ARH LT's, and a tune to go with a small shot of Nitrous on top LOL. Not sure my 6 speed would hold up long though.

DILLIGAF · Sep 4, 2022

My 6 speed is still holding up. Not hard to learn how to use them properly.

crazykid1994 · Sep 4, 2022

Burn2k12Ram said:
No doubt if I am going for performance with my Ram I would go with the EcoDiesel Lower AirBox mod, 6.4 Intake, ARH LT's, and a tune to go with a small shot of Nitrous on top LOL. Not sure my 6 speed would hold up long though.

If you do the 6.4 intake you can just order the entire 6.4 airbox and tube. That’s how I did mine. My low end is insane. I can spin my 35s and it chirps going into 2nd gear. Blows my mind how much low end a stock 5.7 block cab actually make when setup right. If I put my truck in 4 low it’ll drive through the brakes now without any throttle input. It’s insane.

RedSRT4Me · Sep 4, 2022

Go with the larger 1 7/8 primaries. Hemi's love exhaust mods.

When the cat is right behind the header installed like AFE you won't CEL issues.

crazykid1994 · Sep 4, 2022

Wild one said:
Both SW's and ARH's long tubes have a pretty good rep,the differance between them,would come down to which set you can get your hands on these days. Both will rock your boat for cost though,they're great wallet lighteners Honestly i doubt the average guy would notice any differance between the SW's and ARH's as far as power goes.

Seat of the pants doubtful. It may only be a few points different on the dyno. I’m more curious if the timing on the exhaust makes a difference. Arh and kooks use a different order on primary placement.

Wild one · Sep 4, 2022

crazykid1994 said:
Seat of the pants doubtful. It may only be a few points different on the dyno. I’m more curious if the timing on the exhaust makes a difference. Arh and kooks use a different order on primary placement.

They're all 4 into 1 primaries Khris,there is no timing differance when each bank merges into the same cone collector. The only diferances would be if you paired up opposite cylinders on both banks,but that entails a work of art header where the primaries cross over under the oil pan.The gains from that style of header aren't enough to justify the cost or headaches involved in building them and fitting them to a chassis. That's high end Formula 1 header stuff,lol

Burn2k12Ram · Sep 4, 2022

DILLIGAF said:
My 6 speed is still holding up. Not hard to learn how to use them properly.

You do have a point. And actually my Ram has a reman 6 speed already so should have better internals. Bought it as such. Couldnt find out what specific reman tranny it is just have a part number. The part number is T151602. couldnt find out anything specific about it.

Wild one · Sep 4, 2022

Burn2k12Ram said:
You do have a point. And actually my Ram has a reman 6 speed already so should have better internals. Bought it as such. Couldnt find out what specific reman tranny it is just have a part number. The part number is T151602. couldnt find out anything specific about it.

If you drive to their weakness's the RFE's will live. That's no rolling wide open throttle downshifts,get in the habit of manually down shifting it,before you go to wide open throttle,that means manually downshift it first before you go to pass another vehicle on the highway,and no wide open runs in high gear,if you drive to those conditions,the RFE's will handle a fair bit of abuse.

HEMIMANN · Sep 4, 2022

Wild one said:
Looks like AFE now has shorties for the 2500 guys with the 6.4.I'm not a fan of shorties,but they're a slight improvement over the stock manifolds. There's a few guys who want just a set of shorties to replace their stock manifolds but don't want a tune.or the hassle of messing with their cats , it looks like these'll fit their 2500/3500's.

Twisted Steel 304 Stainless Steel Short Tube Header

Performance Gains: This system produced gains of up to +11 HP and +19 lbs. x Ft. TQ., as measured on our in-house dyno. 1-7/8 IN - 2-1/4 IN 304 Stainless Steel Construction: This system is constructed of 1-7/8 IN - 2-1/4 IN mandrel-bent 304 stainless steel tubing for maximum strength and...

afepower.com

The only advantage would be not having to machine the OEM cast iron manifolds flat from thermal cycling warpage?

Either way, the stock logs have to be removed, but these could be installed right away instead of wait for stock logs to come back from the planer machine?

Do we know if these would warp also?

hemihustlin · Sep 4, 2022

Wild one said:
If you drive to their weakness's the RFE's will live. That's no rolling wide open throttle downshifts,get in the habit of manually down shifting it,before you go to wide open throttle,that means manually downshift it first before you go to pass another vehicle on the highway,and no wide open runs in high gear,if you drive to those conditions,the RFE's will handle a fair bit of abuse.

i followed these conditions almost religiously with my 06 and while i had no major mods i sure drove the hell out of the first 3 gears and it never let me down even at 330k kms
did a full fluid and filter change around 180k kms and it shifted like new again. it was starting to get sloppy shifts so i knew it was time haha

Wild one · Sep 4, 2022

HEMIMANN said:
The only advantage would be not having to machine the OEM cast iron manifolds flat from thermal cycling warpage?

Either way, the stock logs have to be removed, but these could be installed right away instead of wait for stock logs to come back from the planer machine?

Do we know if these would warp also?

They don't say what thickness the flanges are,but they look to be about 3/8" ,so they should be fairly stable. A good set of Remflex gaskets will handle a fair bit of manifold warpage before they'll leak.

HEMIMANN · Sep 4, 2022

Wild one said:
They don't say what thickness the flanges are,but they look to be about 3/8" ,so they should be fairly stable. A good set of Remflex gaskets will handle a fair bit of manifold warpage before they'll leak.

Ah, crap - these are only for new Gen V trucks.

Header test

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