The SHIROKAI Ford Mustang S550 Widebody Kit gives your 2015–2017 Mustang real width, presence, and that signature Kaiju stance — while still flowing with the factory bodylines. Crafted from premium automotive ABS plastic for GT and EcoBoost builds.
Ford Mustang S550 (2015-2017) Widebody Kit — Quick Facts
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Fits: 2015–2017 Mustang GT and EcoBoost (plug-and-play), Convertible kit-only (spoiler excluded), 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 2015–2017 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) — best-selling Mustang widebody kit in our catalog
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Status: SHIROKAI's most popular Mustang platform, with strong owner community across US, EU, and Asia
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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 — room for an aggressive wheel and tire setup.
- 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
Ford Mustang S550 Widebody Kit Fitment Guide (2015–2017)
Confirmed fitment for 2015, 2016 and 2017 Ford Mustang:
| Year |
Model |
Fitment |
Notes |
| 2015–2017 |
Mustang GT |
✅ Plug & Play |
Direct fit, no modifications needed |
| 2015–2017 |
Mustang EcoBoost |
✅ Plug & Play |
Direct fit, no modifications needed |
| 2015–2017 |
Mustang Convertible |
⚠️ Partial fit |
Kit fits, ducktail spoiler excluded (different trunk lid) |
| 2015–2017 |
Shelby GT350 & non-GT bumpers |
🔧 With modifications |
Minor front bumper modifications required |
| 2018–2023 |
Mustang S550 facelift |
❌ Different kit |
See the S550 2018–2023 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.
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 |
2015–2017 Mustang GT/EcoBoost (plug-and-play), Convertible (kit-only), Shelby GT350 (with mods) |
| Country of manufacture |
Turkey (Bursa) |
| Catalog status |
Best-selling Mustang widebody kit |
| Support |
Lifetime tech support from manufacturer |
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 asking for the next generation, we built this kit for S550 owners — and it became an absolute best seller. If there’s a Mustang with a SHIROKAI kit at a show, it gets attention and love. The wide fender flares let you run larger, aggressive wheels, and every panel follows the Mustang’s bodylines for an accurate, easier install. Build it for street or show — this wide body S550 setup gives your car a powerful, planted stance.
Wheels & Tires
Dial in your exact setup with our Widebody Wheel Fitment Calculator.
Want to test our quality first? The ducktail spoiler is included in the full kit, and also sold separately (works with both pre-facelift and facelift cars). See the S550 Ducktail Spoiler →
Finishing
The finish is ready for your next step and can be wrapped from the box (light sanding + primer recommended for paint). Add your own wheels or combine with other SHIROKAI styling parts for a full transformation.
Frequently Asked Questions
Will this kit work on my Mustang Convertible?
Partially. The flares, side skirts, lip, and bumper endings all fit a 2015–2017 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 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.
Is this kit different from the 2018–2023 S550 kit?
Yes. The 2018–2023 facelift Mustang has a redesigned front fascia, hood, and headlights — so it uses a separate kit. The 2015–2017 kit you're looking at is engineered specifically for the pre-facelift S550 body. If you have a 2018–2023, see our S550 2018–2023 widebody kit.
How does the width compare to other SHIROKAI Mustang kits?
The 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.
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.
