6.4 Intake Manifold Swap onto a 5.7 HEMI 

Wow I’m surprised mine was the first video to come up. That’s awesome! Yeah, it’s definitely in need of a tune. Now that I have my other maintenance stuff done and the temps around my area are starting to come down I’m going to look into using a new tuner.

Glad it helped!

Yeah awesome! Thank you for your sub and comment. Much appreciated!

Thanks my man!

Very true, although I hadn’t soldered wires in years, but it wasn’t that bad at all. Thanks!

Thanks! Yes, it was an amazing color!

Make sure you get the truck 6.4 intake manifold. It’s supposed to flow even better than the car version.

Oh wow ha ha glad it didn’t come down to that on the 5.7. Best of luck with your install!

Yep with a tune it does. Without a tune I didn’t feel much.

@@n-power-automotive So, you've tuned it and it feels a more powerful now?

@@rene8312 no I still haven’t officially got it tuned. Long story but my email tune is supposed to compensate for the intake, but it really needs to either have a dyno tune or a revised tune made from data logging.

@@n-power-automotive I see. How much additional hp do you think it will make once it gets tuned. My understanding was as much as 18. I have an 06 Charger Daytona I'm making some upgrades, as well.

The top end gains are 10 to 15 without tunes. The midrange is where the true gains are. I saw 35 to 40 from 1800 to 4500. I also ran a year without the srv hooked up. The Z Automotive srv kit is the way to go vs the MSD. Adjustable in the car, and won't fail due to heat under hood.

Thanks it’s a Billet Technology piece.

Beat that cancer so you can Drive man 🤘

Thanks for the support!

Glad it helps!

Yes I agree. I was surprised. But I bought the car used so it had 40k miles of use with no catch can. Regardless I’m glad I got a chance to clean it out while I was in there.

Yeah, 40k miles used. That explains the gunk that was found.

Good luck! I’m hoping to get it retuned soon and hopefully pick up some more power.

@@n-power-automotive true , so when you then you would know if it was worth it or not

@@drumswagger1 yeah that will be the true test if it was worth it or not.

Amen

Not a stupid question at all. Yes it’ll work on both, but you’ll need different length hoses.

I got the AIT extension from Legmaker Intakes and I extended the map sensors using automotive wire I bought from WalMart.

@@n-power-automotive is the wire 18 gauge? I got a few rolls of that I planned on using to wire the cirkit boss and msd box

@@tallguyinahemi I believe so but I’m not 100% sure. It’d been a while.

Just the oval shaped ones that go into each port.

I don’t own this car anymore, but it did have Eagle cylinder heads. They started in 2009. Cam and alternator were untouched, but it wouldn’t have anything to do with that.

Thank you for your reply. Have a great day.

Yes, I believe either way work probably work. All the write ups I read on Charger forums and RU-vid suggest using the injector wire, so that’s the way I did it.

The other forums say it is a green wire to the throttle body to activate the long runner in the intake the whole purpose is to open the long runner in the air intake…

Hmm not sure. Try searching LX Forums or join a Charger FB group.

Great question. I think it was 18 gauge but I’m not 100% sure. I’ll have to check.

I bought them second hand but a company called Billet Technology makes them.

I bought it secondhand, so it had the majority of the wiring harness done on it.

Okay last question before I get started. Can this run without a tune? I plan on getting my pcm unlocked soon but it maybe a week or 2. So would it be fine without a tune for a short time?

@@TexasMadeCruz it’s been so long, so I can’t say for sure, but I think you’d be fine as long as you’re not getting on it.

No I didn’t port the manifold. It might be worthwhile if you are making a lot more horsepower than I am to squeeze every little bit out of it, but for a relatively stock 5.7 it’s probably not.

I don’t know. I didn’t dyno before or after. I ran my best time at the 1/4 track after installing it, but I also installed better gears so I’m not sure I gained much hp/tq at all. I need to get a better tune though so that is a big factor.

From everything I remember the 6.4 intake does nothing for 6.1s. You’re better off sticking with the cast aluminum 6.1 intake.

@@n-power-automotive thank you sir!

Yes it is.

www.legmakerintakes.com

No using the stock 5.7 injectors. They’re supposed to be good for up to 450hp, which I’m no where near. No CEL at all.

@@n-power-automotive thanks bro I probably did too much I went with a bigger throttle body and hellcat injectors and notice a code for p0303 popped up

@@kiddmanny012you definitely need a custom tune with all that.

Do if you upgrade the throttle body

Great question. I’m not sure the answer since it’s been almost 2 years since I owned my Charger. Your best bet is researching it on LXForums.

You can get them from a 6.1 also known as the SRT8 Chrysler or a charger or even challengers

From what I’ve heard, the stock Nag1 can handle 550hp/580 ft lbs. More than that and you need to step up to a built transmission.

Awesom man. Something I’ve been wondering. Seem not to be able to find anything about it. I must be wording my search wrong

It’s a breather filter. Stock it’s a hose that runs to the airbox.

Thank you! You may want to reconsider putting the 392 intake manifold on a pre-Eagle 5.7. The ports don’t match up at all so you have to use adapters, which from what I’ve read defeat the benefits of it. The MSD box is used to switch over from the long runners to the short runners at a certain RPM. The Circuit Boss is used to protect the electrical to and from the MSD box. It’s basically like adding a small remote fuse block.

@@n-power-automotive preciate it. Well I know I want try that.

2009 and up HEMI’s don’t have an EGR valve.

Yes its been done before the car 5.7’s started doing it

MMX sells the wiring and everything that allows to run a 6.4 truck manifold on a 5.7

You might be able to swap the 6.4 truck manifold in. It has a different snout.

@@n-power-automotive good looking on the information nicely done on yours Sir

Hey thanks for the great questions and suggestions! The guy who I bought the 6.4 intake manifold, MDS box, etc from crashed his car so he was parting it out. As far as mods go, I have pretty much all the bolt ons but no internal mods. And while a cam or stroke would absolutely give me way more performance out of every bolt on I’ve done, the 6.4 intake manifold is supposed to give gains in TQ across the low to mid range RPM band. It’s been proven on many 5.7s. That’s why I’m suspecting I need a better tune based off of a data log. I haven’t planned on getting it dynoed, not to say I won’t someday. As far as the injector wire goes, if you watched the whole video at the end I explain how I messed up tapping into the wrong injector wire at first and had to tap into the other one to get an RPM signal, so I did figure that out. But again great questions!

You need adapter plates to fit on pre-09 HEMIs. It’s really not worth it since you won’t get any gains on the older style HEMIs.

No the 6.4 injectors are bigger.

No, it’s a direct for 09+ 5.7 HEMIs.

Thanks. You have to tap into one of the injector wires so the MSD box can read the RPMs so it knows when to switch from the long runners to the short runners.

@@n-power-automotive do you need the MSD box or is that just something for your tuner or something extra

@@goldengam3rxx3 you need it have the active runners inside the 6.4 manifold work. It has nothing to do with the custom tune. You can run the 6.4 intake manifold without it, but there would be no gains over the 5.7 without the runners working.

@@n-power-automotive I have a 2017 challenger rt with MSD already so I shouldn’t need it right?

@@goldengam3rxx3 I believe 2011 and up do not need the MSD box.

I wish I could, but I bought mine used so the wiring harness was already together so I just had to do the power, ground, tap to the fuse box and the injector wire. Do you need to know any of those?

@@n-power-automotive nah I figured it out, I do have a bad Circuit Boss. Thanks for getting back to me though I really appreciate it!

@@idunno3639 glad you figured it out!

Not sure about a Jeep. You might have to search online for that one.

I’m not sure, but I’d think the Shaker brackets would probably be different, but I can’t confirm that 100%.

And to be honest, if I still had this car, I’d probably go back to the stock 5.7 manifold. The cost/effort wasn’t worth it for very little results if any.

@@n-power-automotive you can make more power with the stock one from the 5.7?

@@LKfoodstuff I don’t know if you can make more power or not, it’s just that the 6.4 didn’t add much if anything for all the work. If I went back I’d just get the 5.7 intake ported.

Honestly not as much as I hoped, but I still haven’t gotten a revised tune.

@@n-power-automotive what tune do u have ?

@@fatswagg9417 custom email tune by Hemifever.

i dont think so because the rt engine is 345 while the scat/srt392 are of course 392 cubic inches so youll probably have to get a plate

It will yes, works on all 09+ 5.7 hemi’s

A cam would make a huge difference, but this without a real tune has very little gain in my opinion. I still need a revised tune, I’ve just been lazy that’s why I haven’t got it yet lol. The gains are supposed to be torque in the mid range RPM, nothing down low or up top. Some people claim big horsepower gains in the mid range too, but I’m skeptical.

Breather

Used

@@n-power-automotive Thanks for the reply. Anywhere good to look for one? I dont want to pay $800+ for a new manifold and all associated pieces.

@@98dodge360v8 I got mine off of a FaceBook group.

Lots. Watch some of my other videos.

The tube is the main part of the intake, so yeah, they’re different.

​@@n-power-automotivethe scv actuator wat do u plug in that

Yes, mine is an 09, and yes, starting in 09 the 5.7 changed and went to VVT and different heads. You can get adaptors to make it work, but from what I’ve read you lose most of the benefits of the 6.4 intake manifold on a pre-09 because the ports are a different shape and size. You’d be better off with a 6.1 intake manifold, especially if you plan on putting a cam in it later down the road.

Ok thanks bro for the quick reply

Yes, the brown wire with a blue stripe on 8.

@@n-power-automotive yeah I still haven't gotten mine wired up. I know each is different I ported mine before I installed it I need a throttle body to compensate for the throttle port I did on it and I need a tune to compensate for my mods. These computers expensive lol

@@aaronferguson47 yeah man I’m lucky since I already had a custom email tune from Hemifever I just emailed him and he sent a revised tune no cost. The wiring was definitely the hardest part of the swap, besides cleaning those intake ports out. That was nasty lol.

@@n-power-automotive yeah I saw it was super rough. With this intake manifold you get more low end tq but now with a wider range to hold the curve longer

@@aaronferguson47 that’s what it’s supposed to do. No real horsepower gain, just torque in the low to mid-range power band.

I found mine in a Facebook Charger group. You could probably also find one at a junk yard.

2009 5.7s don’t have an EGR valve.

@@n-power-automotive i didn't realize that.

Oof it’s been a while since I don’t own the Charger anymore, but I think it was 4,800 RPM IIRC.

Great question. I was told there’s no point in using the larger 6.4 injectors because they’d be too much for the 5.7, unless you’re making over 450hp, which I’m definitely not. The tuner would have to scale them back basically to 5.7 specs in order for the engine to run right. The 6.4 fuel rails are identical to the 5.7, as far as I know, so you should be able to use the 6.4 rails if you want.

@@n-power-automotive ok cool. Thank you for the reply. Im looking to do this mod next week

@@agametheofficial37 cool good luck!

You mean the 5.7 intake manifold? If so I still have it.

@@n-power-automotive would you sell it?

@@nickking2075 sure. I don’t have any need for it anymore. You can email me at highway65design@yahoo.com and we can go from there.

@@nickking2075 I have one as well

@@YachtLife I need one for a 2012 Dodge Challenger

You could with adapter plates but it would only be for looks. It doesn’t add anything for pre-09 HEMIs.

😂 ok you leave the gas cap on and let me know how it goes.

@@n-power-automotive I’ll do it knowing that the gas cap is vented Because I have wisdom and experience you are lacking

@@DanielJohnson-ec8rk vented doesn’t mean there’s zero pressure in the fuel lines. I know this from actual experience taking the fuel rail connector off without taking the gas cap off. Guess that happened? Fuel sprayed out. Second time I took the gas cap off, no spray. So, despite my lack of knowledge, I hope you learned something today:

@@n-power-automotive that’s pressure between the pump and rail. Removing the gas cap has zero effect on that pressure. There is no positive or negative pressure in the tank by design

Thanks for watching!