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Ford Mustang GT S550Stage 1 to Stage 4 tuning guide

The S550 GT runs Ford's naturally aspirated 5.0 Coyote V8, so it tunes differently from the turbo cars on this site: software, intake and headers add a modest amount, and the big jump comes from a supercharger kit. This guide focuses on 2018–2023 cars (Gen 3 Coyote, 460 hp) and notes where 2015–2017 cars differ.

Years
2015–2023
Engine
5.0 Coyote V8 (Gen 2 / Gen 3)
Gearbox
6-speed manual (MT82) / 6- or 10-speed auto
Stock power (US, 2018–21)
460 hp / 420 lb-ft
Black Ford Mustang S550 on wet ground outside a warehouse

Power by stage

Stage 1 and 2 are estimates: Ford Performance's and BBK's published gains added to the 460 hp US figure for 2018–2021 cars. Stage 3 figures are the kit makers' own claims. Stage 4 is a community build range. Real results depend on fuel, weather and the individual car.

Stock460 hp
Stage 1≈479 hp Stage 2≈490–510 hp Stage 3623–825 hp Stage 41,000+ hp

Names with an arrow go straight to that part's product page for this car. Names in a dashed outline are other brands that make the part; exact links for them are being added.

1

Tune and intake

+13 to +21 hp

The Coyote has no turbo to turn up, so a tune on its own adds less than on the other cars here. Ford Performance sells calibration kits that come with its cold air intake and a bigger 87 mm throttle body, and claims +19 hp at 6,500 rpm on 2018+ cars. On 93-octane fuel the Gen 3 engine's high compression limits what a tune can add; tuners such as Lund Racing get most of their extra power from E85. 2022–2023 cars are rated 450 hp, and 2015–2017 cars 435 hp.

Typical cost: Lund custom tune from $325 (tuner device extra); Ford Performance calibration with intake and throttle body $1,535.List prices, Sept 2026, before shipping, import tax and fitting.

Stage 1 tunes compared

TuneFuelClaimed powerClaimed torqueNotes
Ford Performance calibration kit (2018–2021)Premium+19 hp at 6,500 rpm+42 lb-ft at 2,000 rpmCold air intake, 87 mm throttle body and ProCal 4 tool; manual and 10-speed; emissions-legal in California
Ford Performance Power Pack 2 (2015–2017)91 US or higher+21 hp peak+24 lb-ft peakGT350 cold air intake, 87 mm throttle body and ProCal 3 tool
Ford Performance Power Pack 1 (2015–2017)Premium+13 hp peak+16 lb-ft peakK&N filter and ProCal 3 tool; emissions-legal in California
Lund Racing custom tune (2018–2023)91/93 US or E85See brand pageLund says the gain on 93 octane is small and the real gain comes on E85
Steeda, BamaPremiumSee brand pageMail-order tunes loaded with a handheld tuner

Recommended with Stage 1

  • Cold air intake recommended Ford PerformanceRoushJLTSteeda

    Included in Ford Performance's kits. On its own, without a tune, it adds little.

  • 87 mm throttle body optional Ford PerformanceBBK

    Part of the Ford Performance kits, and only useful together with a tune.

Before you buyBuy the calibration for your exact model year: 2015–2017 and 2018+ engines use different parts and files, and Ford Performance's 2018+ kit does not fit the Bullitt or Mach 1. Before choosing an E85 file, check that you can buy E85 where you live; in Israel it isn't sold at filling stations.
2

Headers and exhaust

≈+30 to +50 hp

Long-tube headers are the biggest bolt-on gain on the Coyote, and they need a tune written for them. BBK says 30+ hp is typical for its long-tube headers. On 2015–2017 cars, Ford Performance's Power Pack 3 added the GT350 intake manifold and claimed +37 hp peak; Ford no longer lists it.

Typical cost: BBK long-tube headers $850.List prices, Sept 2026, before shipping, import tax and fitting.

Stage 2 packages compared

PackageFuelClaimed powerClaimed torqueNotes
BBK long-tube headers + tunePremium30+ hp typical—Needs BBK mid-pipes; no emissions approval
Ford Performance Power Pack 3 (2015–2017)91 US or higher+37 hp peak+5 lb-ft peakGT350 intake manifold, cold air intake and 87 mm throttle body; no longer listed by Ford

Parts list

  • Long-tube headers required BBK long-tube headers (1-7/8")KooksAmerican Racing HeadersStainless Works

    The main Stage 2 part. They change the exhaust layout, so the car needs matching mid-pipes and a new tune.

  • Catalysed mid-pipes required BBKKooksAmerican Racing Headers

    Choose mid-pipes with catalytic converters. Even with them, most long-tube headers are sold for off-road use only, because they have no emissions approval.

  • Cold air intake recommended Ford PerformanceRoushJLT

    If you didn't fit one at Stage 1.

  • Cat-back exhaust optional BorlaRoushCorsa

    Mostly sound. Little extra power on its own.

Before you buyLong-tube headers are the part most likely to cause trouble at inspection: most are sold for off-road use only, even with catalysed mid-pipes. Check what your country allows before you buy, and keep the original exhaust manifolds.
3

Supercharger kit

623–825 hp

This is where the Coyote really changes. Bolt-on supercharger kits come with their own fuel parts and tune, and several makers publish figures for the S550. The Ford Performance kit, built by Roush, claimed 750 hp and came with a 3-year/36,000-mile limited powertrain warranty when installed by a Ford dealer or an ASE-certified technician. For 2015–2017 cars, Ford Performance claimed 670 hp on 93 octane and Roush 727 hp for its Phase 2 kit.

Typical cost: supercharger kits $6,950–$9,596 (Ford Performance, Whipple, ProCharger, Roush, Edelbrock); Tremec Magnum XL swap $6,200.List prices, Sept 2026, before shipping, import tax and fitting.

Supercharger kits compared (2018+)

KitFuelClaimed powerClaimed torqueNotes
Whipple Gen 5 3.0L Stage 2 (2018–2022)93 US825 hp (flywheel)640 lb-ftAdds a 400 lph fuel pump and bigger injectors
Whipple Gen 5 3.0L Stage 1 (2018–2022)93 US750 hp (flywheel)610 lb-ftThe same supercharger at lower boost
Ford Performance (by Roush) (2018–2021)91 US750 hp670 lb-ftAbout 12 psi; warranty with dealer or ASE install; emissions-legal in California; no longer widely sold new
Roush Phase 2 (2018–2021)93 US750 hp670 lb-ft3-year/36,000-mile warranty on Roush parts; emissions-legal in California
Edelbrock E-Force Stage 1 (2018–2023)See brand page623 hp510 lb-ft3-year/36,000-mile warranty; emissions-legal in California with Edelbrock's tune
ProCharger HO Intercooled (2018–2019)Pump fuel+250 hp—Centrifugal supercharger at about 6.5 psi; includes bigger injectors

Parts list

  • Supercharger kit required WhippleRoushFord PerformanceEdelbrockProChargerVMP

    Kits include the intercooler, fuel parts and a tune. Check exactly what yours includes before you buy.

  • Fuel system upgrade required WhippleVMPProCharger

    Bigger injectors and a fuel pump booster keep the engine fed under boost. Most kits include them.

  • Gearbox upgrade recommended JPC Racing Tremec Magnum XL swapBrady Performance (10R80)

    The MT82 manual is the weak link at this power; the Tremec Magnum XL swap is rated to 700 lb-ft. Brady Performance says the 10R80 automatic's stock clutches hold about 700 hp before it needs a rebuild.

  • Upgraded half-shafts recommended The Driveshaft Shop

    Hard launches on sticky tyres with this much power can snap the factory half-shafts.

Before you buyThe warranties from Ford Performance, Roush and Edelbrock apply only with the installation they require. Budget for the gearbox and half-shafts from the start.
4

Built engine

1,000+ hp

Retailer guidance puts the limit of the factory pistons and rods at about 600 wheel horsepower, roughly 750 at the crank. Beyond that you need a forged short block, a big supercharger or twin turbos, a return-style fuel system for E85 and a custom tune. These are community build ranges, not product claims.

Parts list

  • Forged short block required Ford Performance Aluminator SC short blockManleyWiseco

    Ford's supercharger-spec short block uses forged Mahle pistons and Manley H-beam rods.

  • Big supercharger or twin-turbo kit required WhippleHellion

    Hellion's twin-turbo kits come without a tune or fuel system, so budget for both.

  • Return-style fuel system with bigger injectors required Fore InnovationsAeromotive

    Boosted cars on E85 need a return-style system and injectors of around 1,000 cc or more.

  • Custom dyno tune required Lund Racing

    Every Stage 4 car is tuned on its own.

  • Driveline, cooling and brakes required Brady Performance (10R80)JPC Racing (Tremec)The Driveshaft Shop

    Gearbox, half-shafts, cooling and brakes all have to keep up with the engine.

Before you buyStage 4 is an engine build, not a bolt-on. Choose one shop to build, tune and stand behind the whole package.

Questions to ask the shop

  1. Is my car a 2015–2017 or a 2018+ Coyote, and is the file made for my gearbox: MT82, 6R80 or 10R80?
  2. Is this a custom dyno tune or a mail-order file, and who supports it?
  3. Are the headers catalysed, and will the car pass inspection where I live?
  4. For a supercharger: which fuel parts are included, and which fuel is the tune written for?
  5. Will my gearbox and half-shafts hold this power, and what does the upgrade cost?
  6. Does the kit keep any warranty, and who has to install it for that?