The SHIROKAI 2018–2023 Mustang S550 Widebody Kit is engineered for the facelift Ford Mustang S550 platform, giving GT and EcoBoost builds a wider stance, stronger side profile, and more room for an aggressive wheel and tire setup — while still following the factory body lines.
This is not just an overfender kit. Each SHIROKAI Mustang S550 widebody kit is CNC-cut from platform-specific 3D scan data for cleaner fitment, better proportions, and less fabrication drama during installation. Made from premium automotive ABS plastic, it brings the Kaiju feeling without turning the car into a random bolt-on mess.
Ford Mustang S550 (2018-2023) Widebody Kit — Quick Facts
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Fits: 2018–2023 Mustang GT and EcoBoost (plug-and-play), Convertible kit-only (spoiler excluded), 2018–2020 Shelby GT350 with minor bumper mods
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Material: Automotive-grade ABS plastic, 3D-scanned and CNC-cut from OEM body
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Width added: +3.54 in (9 cm) per side front, +4.33 in (11 cm) per side rear — 220 mm total added width
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Install: 12–16 hours at a body shop, plug-and-play for 2018–2023 GT/EcoBoost with stock bumper
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Includes: Front flares, rear flares, side skirts, bumper endings, front lip spoiler, rear ducktail spoiler
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Price: $4,500 USD (full kit with spoiler) — designed for the redesigned 2018+ S550 front fascia
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Designed for: Post-facelift S550 with redesigned hood, headlights, and front bumper geometry
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Shipping: Worldwide via UPS, ~$600 to USA, ~€400 to Europe, tracked
What’s in the Ford Mustang S550 Widebody Kit
- Front fender flares
- Rear fender flares
- Side skirts
- Bumper fender endings
- Front lip spoiler
- Rear trunk spoiler
Width & Specs
Front fenders add 3.54 in (9 cm) per side, rear fenders add 4.33 in (11 cm) per side, measured from the stock arch — run wider wheels and tires for more grip on road and track.
- High-grade automotive ABS plastic
- Black in mass — wrappable straight out of the box (light sanding + primer recommended for best paint result)
- Easy plug-and-play fit, no major bodywork needed
Ford Mustang S550 Widebody Kit Fitment Guide (2018–2023)
Confirmed fitment for 2018, 2019, 2020, 2021, 2022 and 2023 Ford Mustang:
| Year |
Model |
Fitment |
Notes |
| 2018–2023 |
Mustang GT |
✅ Plug & Play |
Direct fit, no modifications needed |
| 2018–2023 |
Mustang EcoBoost |
✅ Plug & Play |
Direct fit, no modifications needed |
| 2018–2023 |
Mustang Convertible |
⚠️ Partial fit |
Kit fits, ducktail spoiler excluded (different trunk lid) |
| 2018–2020 |
Shelby GT350 & non-GT bumpers |
🔧 With modifications |
Minor front bumper modifications required |
| 2015–2017 |
Mustang S550 pre-facelift |
❌ Different kit |
See the S550 2015–2017 kit → |
| 2005–2014 |
Mustang S197 |
❌ Different kit |
See the S197 widebody kit → |
Not sure about your trim? Email i@shirok.ai — we confirm fitment within 24h.
Why S550 Owners Love It
All you need is steady hands, a heat gun, and some cut-and-sand instrumentals. With a growing community of SHIROKAI Mustang owners, this S550 kit became an absolute best seller and delivered strong results. If there’s a Mustang with a SHIROKAI kit at a show, it gets attention and love. Fitment is one of the biggest strengths of this wide body S550 setup — SHIROKAI is known for parts that fit straight out of the box, so you spend less time in the shop and more time driving. Whether you search for a mustang widebody, a mustang wide body build, or an S550 body kit, this keeps clean bodylines with a bold, planted look.
Wheels & Tires
Dial in your exact setup with our Widebody Wheel Fitment Calculator.
Finishing
Want to test our quality first? The ducktail spoiler is included in the full kit, and also sold separately — same ABS material, same fitment standard, fits 2015–2022 S550 trunk lids. See the S550 Ducktail Spoiler →
Technical Specifications
| Spec |
Detail |
| Material |
Automotive-grade ABS plastic |
| Manufacturing |
CNC-cut from OEM 3D scan data |
| Front flare width |
+3.54 in / +9 cm per side |
| Rear flare width |
+4.33 in / +11 cm per side |
| Total added width |
220 mm across both axles |
| Components |
6-piece kit: front flares (2), rear flares (2), side skirts (2), bumper endings, front lip spoiler, ducktail spoiler |
| Mounting |
Bolt-on with included hardware, drilling and rivnuts required |
| Install time |
12–16 hours at a body shop |
| Paint prep |
Light sanding + primer recommended for best finish |
| Wrap compatibility |
Yes, surface ready out of the box |
| Compatible vehicles |
2018–2023 Mustang GT/EcoBoost (plug-and-play), Convertible (kit-only), 2018–2020 GT350 (with mods) |
| Body generation |
S550 facelift (post-2018 redesigned front fascia) |
| Country of manufacture |
Turkey (Bursa) |
| Support |
Lifetime tech support from manufacturer |
For best results, professional installation is recommended. The finish wraps from the box (light sanding + primer for paint). Every Ford Mustang S550 widebody kit is built for style, function, and quality — the bold flares and precise fit take your Mustang to the next level.
Frequently Asked Questions
Will this kit work on my Mustang Convertible?
Partially. The flares, side skirts, lip, and bumper endings all fit a 2018–2023 Convertible identically to the Coupe. However, the ducktail spoiler is excluded — Convertibles use a different trunk lid geometry that the spoiler doesn't match. Convertible owners typically order the kit without the ducktail spoiler option at checkout.
What about Shelby GT350 fitment?
The GT350 (produced 2018–2020) uses a different front bumper than the standard GT. The kit fits with minor front bumper modifications — typically light trim work to mate the bumper endings cleanly with the flares. A competent body shop handles this in 1–2 extra hours during install. All other panels (flares, skirts, spoiler) fit identically to the GT. Note: GT350 production ended in 2020 — for 2020+ Mustangs above the GT, the GT500 uses a substantially different front-end and is not covered by this kit.
Is this kit different from the 2015–2017 S550 kit?
Yes. The 2018 facelift Mustang received a redesigned hood, headlights, and front fascia — so the kit requires a different front-section design. The actual flare and skirt dimensions are identical between the two S550 kits (220 mm total added width), but the bumper endings and front lip are platform-specific. If you have a 2015–2017, see our S550 2015–2017 widebody kit.
How does the width compare to other SHIROKAI Mustang kits?
This S550 kit adds 220 mm of total width (9 cm front + 11 cm rear per side). Our S197 kits add 240 mm total (9 cm front + 12 cm rear per side). The slightly narrower S550 stance is intentional — it follows the S550's tighter factory body lines for a cleaner, OEM+ aggressive look rather than maximum-width drama. Both generations share the same 9 cm front-fender addition.
How long does installation take?
Typical body shop install runs 12 to 16 hours including test fit, drilling, and rivnut setup. The install requires drilling holes in the fender for rivnut-mounted flares — this is standard procedure for properly secured aftermarket widebody and shouldn't be attempted without the right tools.
Will my doors still open with the flares installed?
Yes. The flares follow the factory door cutline. Both doors remain fully operable at any opening angle. The kit does not interfere with door handles, mirrors, or fuel filler door operation.
What wheel and tire setup works with this kit?
220 mm of total added width supports significantly wider wheel and tire setups than stock — typically 19x11 or 20x11 wheels with 295–315 mm tires in the rear, and 19x10 with 275–285 mm tires up front depending on offset preference. Use our Widebody Wheel Fitment Calculator for precise sizing tailored to this kit.
