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GT350 intake with GT500 airbox / cover?

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BigBeed

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Update. It did not arrive before I left for work but of course it showed up an hour after I got here lol. I will mess with it later on tonight when I get home and post my findings tomorrow.
 

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Update. It did not arrive before I left for work but of course it showed up an hour after I got here lol. I will mess with it later on tonight when I get home and post my findings tomorrow.
Any update?
 
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So unfortunately the GT500 lid does not fit the GT350 airbox in a way that wouldn't require major modifications. It's almost as if Ford changed just enough of it to make sure it wouldn't work.

Starting off the GT500 lid is taller in the back corner and does not sit flat and leaves a gap. You would have to modify the intake tube opening and lose one of the mounting points for it in the process or add a strip of insulation to close the gap.

20210810_051433.jpg


Second, the main holes that hold down the lid are just slightly off. This could be fixed by trimming the tabs on the GT350 box and re drilling the holes but wouldn't fix the first problem. Also I'm not sure there would be enough meat to secure it with the second hole as it is quite close.

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Lastly the lid is just a little bit smaller and does not come flush to the edge leaving another gap. Also due to the shape the gt350 "pre filter" does not fit in such a way that will not leave a gap to let hot air in.

20210810_051532.jpg
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Overall, could it work, yes. But it would not work unless both the GT350 airbox and GT500 lid is modified and even then it probably would still let hot engine bay air in and the whole point of this is to try and stop that as much as possible. Also it would be a tedious process of trial and error to make sure the fit is just right and I was looking for a more simple solution that anyone could do relatively easily.

Looks like I'm off to order at GT500 airbox. I'll test fit that when it shows up to see if it will just bolt right down or if that will require modification to be secured in place. I know it will require the airbox inlet from the Bullitt to work with 18+ which I already have on order. I will most likely start a new thread with a writeup and link it in here. I also have to install my GT350 mani and Bullitt TB as well as get re tuned to see the effects but in the end I think it will be worth it.

Sure an aftermarket intake would be cheaper but I enjoy the process of experimenting and this should allow me to run a closed box with E85 and a flex tune as it shouldn't cause any problems with the MAF scaling.
 

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So unfortunately the GT500 lid does not fit the GT350 airbox in a way that wouldn't require major modifications. It's almost as if Ford changed just enough of it to make sure it wouldn't work.

Starting off the GT500 lid is taller in the back corner and does not sit flat and leaves a gap. You would have to modify the intake tube opening and lose one of the mounting points for it in the process or add a strip of insulation to close the gap.

20210810_051433.jpg


Second, the main holes that hold down the lid are just slightly off. This could be fixed by trimming the tabs on the GT350 box and re drilling the holes but wouldn't fix the first problem. Also I'm not sure there would be enough meat to secure it with the second hole as it is quite close.

20210810_051457.jpg
20210810_051700.jpg


Lastly the lid is just a little bit smaller and does not come flush to the edge leaving another gap. Also due to the shape the gt350 "pre filter" does not fit in such a way that will not leave a gap to let hot air in.

20210810_051532.jpg
20210810_051710.jpg


Overall, could it work, yes. But it would not work unless both the GT350 airbox and GT500 lid is modified and even then it probably would still let hot engine bay air in and the whole point of this is to try and stop that as much as possible. Also it would be a tedious process of trial and error to make sure the fit is just right and I was looking for a more simple solution that anyone could do relatively easily.

Looks like I'm off to order at GT500 airbox. I'll test fit that when it shows up to see if it will just bolt right down or if that will require modification to be secured in place. I know it will require the airbox inlet from the Bullitt to work with 18+ which I already have on order. I will most likely start a new thread with a writeup and link it in here. I also have to install my GT350 mani and Bullitt TB as well as get re tuned to see the effects but in the end I think it will be worth it.

Sure an aftermarket intake would be cheaper but I enjoy the process of experimenting and this should allow me to run a closed box with E85 and a flex tune as it shouldn't cause any problems with the MAF scaling.
DAMMIT! I was hoping this would work. Thanks for experimenting with it. Hopefully the whole box works plug and play!
 

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DAMMIT! I was hoping this would work. Thanks for experimenting with it. Hopefully the whole box works plug and play!
Me too. No problem! I got this idea in my head and I won't let it die until I figure it out or write it off as a failure lol. That's what I'm hoping as well!
 

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Well I've ordered the box and lid to install on my GT350 intake. Since I have a 16 I'm hoping the GT350 snorkel will work just fine.
 

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I ordered from the links provided on the first page from Tasca. It was 144 shipped.
 
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Well I've ordered the box and lid to install on my GT350 intake. Since I have a 16 I'm hoping the GT350 snorkel will work just fine.
It should work just fine but from looking at the GT500 lid you will have to put a small strip of insulation around the intake tube where it bolts up to the box as the GT500 tube is a little bigger.
 

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Update: I ordered the GT500 airbox, pre filter, and mounting hardware on the night of the 10th. According to Ford my parts will be at the dealership on the 20th, but I checked the order status through their site and it says they are there so I am going to call in the morning and see what the dealio is lol. I had to order through parts.ford.com because there were a couple parts I could not find no matter how long I searched. Luckily the dealer closest to me that I could select from had pretty good prices although they weren't as cheap as Tasca or Levitown on the parts I could find there. I will post all the part numbers once I get them in.
 
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So bit of an update. I got the parts today. Did a dry fit of the GT500 airbox and lid and it fits with no issue. Was kind of a PITA to get in with the intake tube, sound tube, and engine cover on (all of which will be removed if doing a GT350 intake manifold and the sound tube will be removed if doing a GT350 intake.)

It fits great. You can also use the mounting hardware and grommets from the factory 18+ air box but I will include the part numbers below incase you want a separate set to keep those with the stock air box. Also they are a little bit of a pain to remove by hand but a flat head gets them out quick

It looks as though it will attach to the front air inlet from the grille as well using the Bullitt tube though I was not able to confirm as I left that part at home by mistake. Also getting it in there with it attached would definitely require removing the intake tube and engine cover. (I have a PP2 and would have to remove the strut tower brace to do this and I was just doing a quick dry fit.)

It will also fit under the Engine cover with no issue if you are only doing a GT350 intake.

Note that this is the stock GT intake tube, The GT350's comes down more and at a slight angle.

20210818_183019.jpg
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Also there are no previsions on the GT500 airbox for the clip that holds the MAF sensor ware in place but should be able to get away with drilling a small hole in this support webbing marked by the red dot. (Just an approximate location.)

20210819_220519.jpg


The pre filter might need to be glued into place or heated up and shaped as it forms a gap by the opening. The top gap shouldn't be an issue once installed as the lid sandwiches it in place up against the rad support bar.

**EDIT** This goes on before the airbox tray goes in and locates in a notch in the body and seals up against the outside of the box.


20210819_224908.jpg


The stud bolts for the GT350 hood seal can not be used with the threaded clips from the GT500 tray. They are too big to fit the proper way and too short to bolt down if flipped to use the smaller threading. They work if flipped on the outer most holes but are not long enough to tighten down around the intake tube. However the clips from the GT350 tray can be put on and you can use the stud bolts then.

**EDIT** I ordered the body mount threaded clips and bolts to secure the airbox to the body and planned to use the ones from the GT350 airbox and forgot. It just so happens that they came in packs of 4 when ordering from the Ford site.

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Ford has bolts with a captive washer that come in a pack of 4 that fit the threaded spring clips and I will list the part numbers below.

20210819_225035.jpg
20210819_224850.jpg


There is about a 1/4" gap around the intake tube that will be need to be filled with a foam strip or rubber weather stripping. I suggest to get the really squishy kind with adhesive backing in 1/2" thickness and apply it to the tray and lid and let it squish down.

20210819_224949.jpg
20210819_224959.jpg
 
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So this is the list of everything you'll need to do this. I found that Levittown Ford Parts has almost every piece you could possibly need at very good prices and they are also a forum sponsor and I believe they offer free ground shipping on big orders for forum members.

You can reuse the hardware and grommets from your factory airbox to mount it but I will include the part numbers below.

GT350 intake. Can find these pretty cheap second hand on ebay, car-part.com or the forum/fb.
Alternatively you can get the Ford Performance intake and throttle body which comes with the GT350/Bullitt throttle body and adapter.
15-17 NO calibration for if you are tuned
Ford Performance 5.0L Cold Air Intake (No Cal) - M-9603-M50 | Levittown Ford (levittownfordparts.com)
15-17 WITH Ford Performance calibration
Ford Performance Intake & Calibration Power Pack 2 - M-9603-M8A | Levittown Ford (levittownfordparts.com)
And for 18+ cars you can get the power pack that comes with the intake, Bullitt throttle body and calibration.
Ford Performance Calibration W/ Cold Air Intake & Throttle Body - M-9603-M8B | Levittown Ford (levittownfordparts.com)

All of these will include some of the parts I list below.

GT350 Throttle body for 15-17
Ford Performance Throttle Body 87MM - M-9926-M52 | Levittown Ford (levittownfordparts.com)

Bullitt Throttle body for 18+
Ford Performance 87MM Bullitt Throttle Body - M-9926-M50B | Levittown Ford (levittownfordparts.com)

Throttle body adapter
Ford Performance 87MM Throttle Body Adapter - M-9474-M5087 | Levittown Ford (levittownfordparts.com)

GT500 airbox tray
Original Tray - Engine Air Cleaner KR3Z-9A612-A | Genuine Ford Auto Parts (levittownfordparts.com)

GT500 airbox lid
Original Cover KR3Z-9661-A | Genuine Ford Auto Parts (levittownfordparts.com)

OEM air filter
Original 2015-2020 Ford Mustang Air Filter FR3Z-9601-B | Genuine Ford Auto Parts (levittownfordparts.com)

Optional JLT OEM replacement air filter. Has open end.
JLT Performance Mustang Replacement Air Filter Shelby GT3500 2010-2014/ GT350/R 2015-2020/ GT500 2020-2021 (cjponyparts.com)

Inlet duct to connect to grille opening 15-17
Original 2015-2020 Ford Mustang Inlet Duct FR3Z-9C675-B | Genuine Ford Auto Parts (levittownfordparts.com)

Inlet duct to connect to grille opening 18+
Original Tube - Air Cleaner Intake KR3Z-9C675-A | Genuine Ford Auto Parts (levittownfordparts.com)

Airbox pre filter. I could not fid this on any parts site and could only find it through Ford.
Air Filter | FordUS

Threaded spring clips. You need 4 of these for lid, 1 for body mount. - Use to secure lid/mount airbox to body.
Original 2007-2021 Ford Fender Nut -W520812-S439 | Genuine Ford Auto Parts (levittownfordparts.com)

Captive washer bolt. You need 4 of these for lid, 1 for body mount. - Use to secure lid/mount airbox to body. Could also use M6X1.0X25MM bolts and a washer. Flanged M6x1.0x25mm Bolt 5 Pack
Original 2015-2020 Ford Mustang Lower Tray Bolt -W505427-S307 | Genuine Ford Auto Parts (levittownfordparts.com)

Threaded spring clip to secure airbox lid only. You need 4 of these
Original 2015-2020 Ford Mustang Upper Cover Upper Insulator 6L3Z-9P686-A | Genuine Ford Auto Parts (levittownfordparts.com)

Stud bolt to secure airbox lid only. Could also use M8X1.25X25MM bolt and washer. Flanged M8x1.25x25mm Bolt 5 Pack
Original 2015-2020 Ford Mustang Upper Cover Stud -W711061-S437 | Genuine Ford Auto Parts (levittownfordparts.com)

Grommet to bolt down airbox
Original 2015-2020 Ford Air Duct Insulator 5M6Z-9F854-A | Genuine Ford Auto Parts (levittownfordparts.com)

Metal sleeve for above grommet
Original 2015-2020 Ford Air Duct Sleeve 5S4Z-17C481-A | Genuine Ford Auto Parts (levittownfordparts.com)

Rubber insulator for post that comes off airbox
Original 1999-2020 Ford Mustang Air Cleaner Assembly Insulator F5ZZ-9P686-AA | Genuine Ford Auto Parts (levittownfordparts.com)

Rubber insulator for bottom of airbox
Original 2015-2020 Ford Mustang Lower Tray Grommet 8S4Z-9P686-A | Genuine Ford Auto Parts (levittownfordparts.com)

Will also need adhesive foam tape to seal around the MAF tube
Frost King L346 Self-Adhesive Open Cell Tape, 17 Ft L X 3/4 in W 1/2 in T, Polyfoam, Charcoal - Masking Tape - Amazon.com
 
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Awesome, thanks for info. Looks like everything will work out. I figured I would need the foam tape around the maf tube, and I have a kit of assorted nuts and bolts that hopefully has some in it that fit. I figure I'm gonna be waiting a while for the box and lid to show up as the order is still "in progress" or processing.
 
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Awesome, thanks for info. Looks like everything will work out. I figured I would need the foam tape around the maf tube, and I have a kit of assorted nuts and bolts that hopefully has some in it that fit. I figure I'm gonna be waiting a while for the box and lid to show up as the order is still "in progress" or processing.
I ordered the clip for the body mount so that's why the threading was wrong. The airbox does not come with the clips and they are a separate part. I updated the post with links to all the parts. you can use the clips and stud bolts from the GT350 airbox and If you don't like the studs they can be replaced with an M8X1.25X25MM bolt and washer.

**EDIT** I put links above to McMaster-Carr for flanged bolts which should do the trick just fine.
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