2013 Mustang GT Fuel Injector Question

Short version:

Yes—the 2020+ GT500 (Predator) 55 lb/hr injectors drop right into a 2013–2014 Coyote (5.0) with no spacers or plug adapters.


Details:

The Ford Performance set you want is M-9593-M55GT (OE KR3Z-9F593-AA). They’re USCAR-connector, high-impedance, EV14 long-body injectors with a dual-cone Coyote spray pattern—so they physically and electrically match the ’11–’14 5.0 harness and rails. No hats/spacers needed.

Multiple vendors list these as EV6/EV14 long length (same installed height as your stockers), again implying direct fit on Coyotes.

A quick note so you don’t get tripped up: the older 2013–2014 GT500 52 lb EV14 “short” injectors do require rail spacers or top hats on Coyotes. That’s a different part set than the 2020+ injectors you’re considering.


Tuning-wise, Lund’s recommendation is common—they have data/support for the M55GT set (55 lb/hr @ 40 psi; ~65 lb/hr @ 55 psi), so it’s a clean swap from the ProCharger-supplied Bosch 52s they don’t support. Just be sure your tuner loads the correct characterization data.

The Bosch 0280158117 (Bosch 62642)
These are the injectors ProCharger includes in a lot of their 5.0 kits.
They are indeed the older GT500 injectors used on the 2007–2012 5.4L supercharged cars.


They are EV6/EV14 short-body injectors (often called “compact” EV14s).
Their overall height from O-ring to O-ring is about 48 mm versus roughly 60 mm for a long-body EV14.


Because of that shorter length, ProCharger supplies fuel rail spacers in their kits so the rails sit lower and seal correctly on the shorter injectors.



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The 2020+ GT500 injectors (KR3Z-9F593-A / M-9593-M55GT)
These are EV14 long-body injectors, same physical dimensions as the OEM Coyote 5.0 injectors (11-14, 15-17, etc.).
O-ring to O-ring height is right around 60 mm, and they use the same USCAR connector and upper/lower O-ring sizing.
They drop straight into your factory Coyote fuel rails with the stock rail standoffs — no spacers required or desired.



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So, putting it together:

Your ProCharger spacers were only necessary because of the shorter Bosch injectors.
If you’re switching to the 2020+ GT500 injectors, you’ll need to remove the ProCharger-supplied spacers and reinstall the OEM-height rail standoffs (or simply bolt the rails directly in their original position if your manifold uses built-in bosses).


This will return the rail height to factory spec and give the long-body GT500 injectors the proper seat depth in both the manifold and the rail.


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Quick physical check
When you install the GT500 injectors:


The lower O-ring should sit just below the top of the injector bore.
The upper O-ring should engage the rail without compressing or forcing the injector off-center.
The fuel rail bolts should snug down with the injectors resting evenly — no preload or tilt.


If you feel any need to “pull” the rail down to make contact, stop and verify height; that’s a sign you still have spacers in the stack.



Therefore:

The Bosch 0280158117 injectors in your ProCharger kit are short-body EV14s.
The 2020+ GT500 55 lb/hr injectors are long-body EV14s — the same length as your stock 5.0 injectors.
So yes, you’ll want to remove the ProCharger spacers and return to OEM fuel rail height when you install the GT500 injectors.



IMO, Procharger has had [plenty] of time to address this issue and get some damned tuning data for the injectors that come with the kit or go to a better injector. But.... That is another story.

KHills5058 said:

Thanks for the explanation! Now, I hope I still kept the OEM spacers....

Say I was a dummy and threw them out, what would be a good short-body EV14 injector to use that you think Lund would support?

Click to expand...

At that point, I would call Lund directly and purchase exactly what they tell you.

They’re the same “family” and physical form factor, but not the same injector as far as tuners are concerned.


Physically similar? Yes.

Part-number identical? No.

Tuning support the same? Also no — MU52 is supported because the data is known and consistent, while the generic Bosch 52 from the kit isn’t backed by Ford-style data.

From what I can gather, the OEM Coyote (11–14 5.0L) fuel rail standoffs (or “spacers”) measure right at 0.590–0.600 inch tall (15mm) from the intake manifold pad to the bottom of the rail boss.

Of course, maybe a run to the JY if you can't find yours or maybe somebody else can chime in that can measure theirs.

You could also mock it together and measure with a caliper:

Seat one long-body injector (new O-rings) in the manifold with the rail loosely in place, no spacer.
Measure from the manifold pad to the underside of the rail tab when the injector is fully seated and the upper O-ring is just touching the rail cup.
That distance, minus ~1 mm for O-ring compression, is your required spacer height.
Do a couple from each bank and average; it’ll land you on the true “OEM” standoff height.

I would look for some phenolic material to make them from but you could stack washers if you really had to.