6.1/6.4 Exhuast Manifolds on 5.7?

nolimits76 · Jun 20, 2014

With the Challengers, it’s pretty common to ditch the crappy 5.7 exhaust manifolds in favor of something that breathes better. In all honesty, the SRT manifolds (both 6.1 and 6.4) are common replacements as they are good up to more HP than most people produce.

So this brings me to my main question – is it possible to swap the stock Ram 5.7 exhaust manifolds out in favor of the SRT 6.1/6.4 manifolds (shorty headers). Seems logical they would fit. Just didn’t know if anybody had done it yet and if there were any things to be concerned about.

I am aware aftermarket shorty headers exist, but for the purpose of this conversation I am looking primarily at Dodge/Ram parts. Unless you are going to prove to me how XYZ header produces some major advantage.

BlownGP · Jun 20, 2014

I know somebody on the Z forum runs/ran the OBX LT's from a Cherokee SRT8. I think there was a few things you had to modfiy. It's been a while since I read that thread though.

BlownGP · Jun 20, 2014

Wonder if these would work. Are the 08 HEMI's head that much different.

nolimits76 · Jun 21, 2014

Sounded like you were going to post a link, but I don't see one.

I haven't seen the Ram 5.7 head disassembled, but presume it has the D-shaped exhaust ports. That is what the Challenger 5.7's (all them, 09+ VVT) have anyhow. I know the older (2008 and older) 5.7's have round exhaust ports so they are slightly different.

I know the 2008-2010 SRT's (6.1 non-VVT) and the 2009+ SRT's (6.4 VVT) also have the D-shaped exhaust ports, which is why they are an easy swap on the 5.7 Challengers.

BlownGP · Jun 21, 2014

Yeah, I was going to post this link. Sorry
Product Name - OBX Racing Sports

But looks like you answered my question. Won't work.

With your reasoning sound like anything from a SRT would work. I would the routing of the pipes might be concern so they clear everything since there not molded for a RAM

Statcher1 · Jun 21, 2014

It would be nice if the SRT shorties would fit. My dads planning on a set of longtubes on his 6.1 challenger in the near future. I'd definitely scavenged them

Sent from the Rocket in my Pocket

kschaefer426 · Jun 21, 2014

didn't fasthemiram12 have jeep srt shorties on his ram? if you can find his build somewhere in here I'm pretty sure he did it and told everyone how he did it

fasthemiram12 · Jun 24, 2014

kschaefer426 said:
didn't fasthemiram12 have jeep srt shorties on his ram? if you can find his build somewhere in here I'm pretty sure he did it and told everyone how he did it

They are still on the truck at the moment

TylerB · Jun 24, 2014

The headers fit just fine, just have to rework the mid-pipes.

nolimits76 · Jun 25, 2014

TylerB said:
The headers fit just fine, just have to rework the mid-pipes.

Define "rework".

On the Challengers, the 5.7 manifolds have (2) O2 sensors on each side of the manifold and none on the mid pipes/cats. The 6.1/6.4 manifolds only have (1) O2 sensor per side and (1) O2 sensor per side on the 6.1/6.4 style cats. That being said, when you do the manifold swap, you also have to do a mid pipe swap. Also, you have to get (2) longer O2 sensors to fit the SRT style mid pipes.

Is that what you mean? If so, I'm familiar with it. Or are you talking custom making/bending mid pipes to connect the SRT manifolds to the cat-back?

BlownGP · Jun 25, 2014

So those OBX headers would work?

Why haven't more people done it? I know the JBA's are out now for the cheaper option but OBXs are cheaper still.

nolimits76 · Jun 25, 2014

BlownGP said:
So those OBX headers would work?

Why haven't more people done it? I know the JBA's are out now for the cheaper option but OBXs are cheaper still.

I'm not sure. The description says the OBX stuff is for 07-08 5.7 Hemi's. I didn't see a picture of the exhaust port, but I have a feeling it has the square ports vs the D-ports (2009+ VVT). I'm not very familiar with the older 5.7 Hemi (before VVT) so I'm not 100% sure if they would work or not.

I do know looking at the OBX system compared to the Challenger 6.1/6.4 SRT manifold + SOLO mid pipe/cat setup (similar to stock mid/cats except high flowing) look pretty different but in fairness the OBX setup is long tubes.

Below is a picture of the Challenger parts (these are mine -- and for sale, but would re-use them if possible).

Challenger 6.4 SRT Manifolds + SOLO Mid Pipes/Cats:

Flowmaster Exhaust for Challenger (to show how it carries on -- notice no Y pipe):

OBX Setup (07-08 Ram):

TylerB · Jun 25, 2014

nolimits76 said:
Or are you talking custom making/bending mid pipes to connect the SRT manifolds to the cat-back?

This

fasthemiram12 · Jun 25, 2014

OBX headers for a 06-08 SRT Jeep should fit with minimal modification.
O2 extensions will probably be needed.

I had Kooks longtubes on my 2011 that were off an 06

DANIEL JUDD · Sep 27, 2020

What year Jeep are those SRT manifolds off of? I have a 2016 and would like to do this same thing. Ive sent @fasthemiram12 messages but not sure if hes still on here.

6.1/6.4 Exhuast Manifolds on 5.7?

nolimits76

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BlownGP

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BlownGP

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nolimits76

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BlownGP

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Statcher1

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kschaefer426

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fasthemiram12

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TylerB

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nolimits76

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BlownGP

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nolimits76

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TylerB

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fasthemiram12

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DANIEL JUDD

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