Best 21 GT intake manifold upgrades

[Sotty1]

On my 21 i have a full exhaust system headers back. My question is. In yallls opinion, whats the best intake set up. Everything from the manifold to the filter . Plan in getting a VMP 93 tune. Was thinking 1320 junkie ported GT350 intake with a Steeda pro flow open box cold air

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[Dapepper9]

Subjective. Depends what you're trying to accomplish. You want the 1/4 king? CobraJet or the new Holley. Gt350 is a solid upgrade over the 18 but it's also no CJ. I would do gt350 > Boss because they perform the same mostly and gt350 fits better

 

[Jstang23]

To be honest the 21 intake manifold is already pretty good. You won't see any gain from a gt350 intake, actually you'll lose a bit. The boss intake is considerably worse and you see some gains in the middle of the power band with the cobra jet. But peak horsepower the 2018+ intake manifold is amazing. The engineers maximized the 2018 intake for peak horsepower arriving at 7000 rpm and made it smaller to fit under the new hood.

Here's a good article that compares them all on a bolt on Gen 3 coyote.

https://www.motortrend.com/how-to/dyno-every-ford-coyote-intake-manifold-on-gen-3-crate/

Hope this helps!

 

[AZlb5.0]

If yours a was a 15-17 I’d say CJ or GT350. Being that yours is a ‘21 unless you’re putting some hard boost through it stick with your stock manifold.

 

[GregO]

Was thinking 1320 junkie ported GT350 intake

The GT350 electrical and plumbing will not connect like it does on the GEN2 15-17 5.0’s
There’s a reason Ford Performance doesn’t offer a GEN3 PP3.

 

[EFI]

There’s a reason Ford Performance doesn’t offer a GEN3 PP3.

That and there's virtually no gain in power.

OP stick with your intake or go with a CJ if you plan on revving to 8000+.

 

[GregO]

That and there's virtually no gain in power.

OP stick with your intake or go with a CJ if you plan on revving to 8000+.

We’ve been down this road,
There’s power after the 18+ power peak if the Dyno pull isn’t chopped early.

Over and Out

 

[GregO]

@Sotty1

This just might work, you’d probably be the first to do it on M6G.
https://www.facebook.com/marketplace/item/751422123092417/?mibextid=dXMIcH

 

[Dapepper9]

GT350 offers power through about the entire rev range over the 18gt AND above the 7400 limit the 18 makes power to. The gt350 will make power to 7800-8000. 18 is the slowest manifold option. It just doesn't hang.

No ford doesn't offer a PP3 pack with the GT350 because they made significantly more money by building entire trims around it (Mach 1 and Bullit ring a bell?). Hell my crewcab truck shows .2 better with gt350 than with the 18. 18 is a turd and I'm tired of everybody pretending it's not.


350 vs 18 on Gen 3 before tuning. Tuning only widens the gap, especially up top

 

[Jstang23]

GT350 offers power through about the entire rev range over the 18gt AND above the 7400 limit the 18 makes power to. The gt350 will make power to 7800-8000. 18 is the slowest manifold option. It just doesn't hang.

No ford doesn't offer a PP3 pack with the GT350 because they made significantly more money by building entire trims around it (Mach 1 and Bullit ring a bell?). Hell my crewcab truck shows .2 better with gt350 than with the 18. 18 is a turd and I'm tired of everybody pretending it's not.


350 vs 18 on Gen 3 before tuning. Tuning only widens the gap, especially up top

You can't compare the f150 coyote to the mustang coyote. While they make similar power, they have different pieces that change the nature of how the react to certain modifications. Also that's a pretty bold statement saying the 18 is the slowest manifold when Motor Trend compared all of them on the same motor and the 18 came out on top. Take a look at that article

 

[Dave2013M3]

On my 21 i have a full exhaust system headers back. My question is. In yallls opinion, whats the best intake set up. Everything from the manifold to the filter . Plan in getting a VMP 93 tune. Was thinking 1320 junkie ported GT350 intake with a Steeda pro flow open box cold air

IMHO, if you aren't pushing more than 7500rpm I wouldn't bother with the GT350 intake.

 

[Jstang23]

IMHO, if you aren't pushing more than 7500rpm I wouldn't bother with the GT350 intake.

Even then, you can just send your 18 manifold to get ported and get better results for cheaper!

 

[Dapepper9]

You can't compare the f150 coyote to the mustang coyote. While they make similar power, they have different pieces that change the nature of how the react to certain modifications. Also that's a pretty bold statement saying the 18 is the slowest manifold when Motor Trend compared all of them on the same motor and the 18 came out on top. Take a look at that article

1. wasn't comparing the 2 but also, wrong. 15+ there's a firing order difference for NVH but overall specs are the same on the cams and 15-17 has a 1/2 point less compression. The same things apply to both. You can directly compare them, a truck is a heavy mustang these days.
2. It is the slowest. I've run them all and my own experience mirrors that as well as anybody in the all-motor community. There's a reason nobody fast runs it. The motortrend article is old, poorly tuned and not worth much at all save for the dimensional specs. The dyno I shared wasn't a truck, it was a car without tuning. Ford sold this as an upgrade and then turned it into 2 trim levels for a reason. Motortrend gets things wrong too, its ok. Try the all-motor crowds and see what they think. Spoiler: CJ>Boss/GT350>18.

The only time the 18 manifold is the best choice is if you refuse to rev past 7000-7200. Any higher and you will be faster with any of the 3 popular alternatives

 

[AZlb5.0]

IMHO, if you aren't pushing more than 7500rpm I wouldn't bother with the GT350 intake.

look at this post. Now ask yourself how often are you out there running the streets or the track. Who are you running against? Is it an every weekend thing? If not then if you have a FBO with a stock manifold and a tune you’re beating 98% of cars on the streets.

 

[Jstang23]

1. wasn't comparing the 2 but also, wrong. 15+ there's a firing order difference for NVH but overall specs are the same on the cams and 15-17 has a 1/2 point less compression. The same things apply to both. You can directly compare them, a truck is a heavy mustang these days.
2. It is the slowest. I've run them all and my own experience mirrors that as well as anybody in the all-motor community. There's a reason nobody fast runs it. The motortrend article is old, poorly tuned and not worth much at all save for the dimensional specs. The dyno I shared wasn't a truck, it was a car without tuning. Ford sold this as an upgrade and then turned it into 2 trim levels for a reason. Motortrend gets things wrong too, its ok. Try the all-motor crowds and see what they think. Spoiler: CJ>Boss/GT350>18.

The only time the 18 manifold is the best choice is if you refuse to rev past 7000-7200. Any higher and you will be faster with any of the 3 popular alternatives

Ok look, not trying to start an argument but the motors are different. That's a fact. The camshafts between the two are also different. The Mustang has long-duration intake cams while the F-150’s are substantially shorter. The earlier the intake closes the greater the cranking pressure, which is necessary to achieve the low-end torque. The F-150 Coyote also has a front-mounted oil cooler, less robust oil pump gears, and no windage tray. The timing cover is less ribbed, and the alternator location is different as well.

Second the dyno test comparing all of them were run to 7500 rpm (8000 with the CJ) with the CJ showing LESS power at the higher rpms.

Also the article is from 2019 (not that old) and tuned by Eddie Rios, if you're calling him a bad tuner then you're a fool. Plenty of fast people run 18 manifolds. In fact several of the top 1/4 times have ported 18 manifolds. Don't go around saying blanket statements like "the 18 is only the best if you refuse to rev past 7200." It's wrong and it confuses people.

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