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Best 21 GT intake manifold upgrades

Cordero1

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Smart move
The only option that might work is the Mach 1 manifold I post up but you’d probably be the first M6G guy to try that combo.
I was going to go the Bullit/Mach1 option ported, until I got talked out of it by some members on here & a couple of vendors. Felt like the vendors advising against it was solid advice. Ended up using the $ for some cheap SVE rear drags & tires.
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GregO

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I was going to go the Bullit/Mach1 option ported, until I got talked out of it by some members on here & a couple of vendors. Felt like the vendors advising against it was solid advice. Ended up using the $ for some cheap SVE rear drags & tires.
Well, someone bought the FBMP Mach 1 manifold in the last 24 hours.
That was one hell of a good deal !
 

Dapepper9

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I was going to go the Bullit/Mach1 option ported, until I got talked out of it by some members on here & a couple of vendors. Felt like the vendors advising against it was solid advice. Ended up using the $ for some cheap SVE rear drags & tires.
It's looking like I'm going to port the stock manifold. I spoke with VMP they also said stick with the stock manifold but port it
That's because they make a killing selling the ported 18s. Talk to a tuner and not a vendor.
 

Cordero1

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Well, someone bought the FBMP Mach 1 manifold in the last 24 hours.
That was one hell of a good deal !
I don't have fb. Glad someone got a good deal though
 

Cordero1

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That's because they make a killing selling the ported 18s. Talk to a tuner and not a vendor.
That's the thing. They weren't trying to sell me either. Both that I talked to said the gains weren't worth the money. The only tuner I did try to talk to took so long to respond I just figured they blew me off.
 

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K4fxd

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91gt331sc

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They were asking 300 with the TB.
What it sell for?
I just picked it up this morning. Going to try and make it work on my 21 with imrcs. It might take a mach one engine harness or some rewiring to get it to work. I also was going to see if it would work with the ford performance tune package already on the car before I do a custom tune and e-85
 

Cordero1

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I just picked it up this morning. Going to try and make it work on my 21 with imrcs. It might take a mach one engine harness or some rewiring to get it to work. I also was going to see if it would work with the ford performance tune package already on the car before I do a custom tune and e-85
I thought the Bullit/Mach 1 IM were a direct fit for 18+
 

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K4fxd

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Can you post a picture of the rear of the manifold showing the IMRC plugs?
 

AZlb5.0

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I think this passes the critical thought test. Even back in the PP3 package days, it was shown then that while the peak torque was lower, the cars made more power over the whole rev range once you got out of the low end. The GT350 manifold clearly takes advantage of the coyote's ability to flow huge amounts of air. It's not so much that the 18 manifold is bad (far from it) but its clearly a hybrid of sorts. You can't have it all, so where you lose in top end, you gain in the low end, which matters far more for a street driven and enjoyed car. It's like if a truck manifold and a 350 manifold had a baby.
I learned a lot when working with LS engines, when it comes to producing low end torque and power. That’s where it’s at when dealing with streetlight to streetlight runs. Majority of the times, that you’ll encounter someone that wants to play, is going to be streetlight to streetlight. Rarely does someone on the highway wants to play unless it’s a newer 392/ZL1/Demon or other Mustangs. I’ve encountered 2 vehicles and one was a Camaro and the other was an older (2015+) 392. The Mustangs dominates on the highway/higher RPM it just does over the older pushrod motors. And like I mentioned already, with a FBO with a stock ‘18+ manifold Mustang and a tune we are beating 98% of cars on the street.
 

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Zero point in porting a plastic intake IMO. First, all your doing is smoothing the glue joints. BFD, cause of something called the 'boundary bleed off layer' . The air doesn't cling to the walls, so glue joint on not, the airflow never touches it. Now if it was a wet intake, that's a different matter. Most if not ALL the gains is the port exit, IE: port matching to the cyl. head. Second, get to crazy with sanding and you'll get thin spots. Those spots now become weak points which could easily crack and lead to 'hidden' fueling issues. Especially around the injector mounts. Big bucks for 8 hp, no thanks. Manufactures use plastic intakes cause they are CHEAP to produce, easy to form. Period.

You want an aluminum intake for serious porting. Plenty of meat to shape it however you want, and still plenty strong, and you see the absolute maximum gains with the coyote. Both NA & FI.
 

GregO

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The air doesn't cling to the walls
Boundary layer, both gasses and liquids will attach to the surface of the port walls. Doesn’t matter if it’s wet or dry.

About your PMAS, what’s the story there ?
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