Specifications, wheels, installation and delivery — before you order.
Mounting hardware is sold separately. The selected configuration determines whether the ducktail spoiler is included.
Every SHIROKAI widebody is designed around a significantly wider wheel and tire setup.
Exact specifications depend on ride height, suspension, brake package and the look you're after.
Use our Wheel Fitment Calculator to find a recommended starting point for your build.
p.s. No you can't use your factory wheels with spacers, you will need 80-120mm spacers and it's just unsafe for public roads.
Professional installation is recommended.
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DIY installation approved.
SHIROKAI panels arrive CNC-trimmed and developed from 3D scans of the original body, reducing unnecessary fabrication compared to universal or cheap fiberglass kits.
Ready to wrap out of the box.
Fits without sanding or cutting. Paint prep (light sanding and primer) applies only if you paint.
Every build is slightly different. A skilled installer will always achieve the best result.
Every kit is carefully inspected before shipping and securely packaged for international transport.
Once dispatched, you'll receive tracking information.
For deliveries to the United States, import duties are included in the product price. Shipping is calculated separately at checkout.
Import duties and local taxes outside the US, if applicable, are determined by your country's customs regulations.
Browse our complete FAQ → or send us a message, we're happy to help!
Check your exact year and trim before ordering.
| Years | Trim | Fitment | Notes |
|---|---|---|---|
| 2015–2017 | Mustang GT | ✅ Direct fit | Developed specifically for GT models |
| 2015–2017 | Mustang EcoBoost | ✅ Direct fit | Direct fit with the factory bumper |
| 2015–2017 | Mustang Convertible | ⚠️ Partial fit | Kit fits, but the ducktail spoiler is excluded due to the different trunk lid |
| 2015–2017 | Shelby GT350 & non-GT bumpers | 🔧 Bumper check | Different front bumper: test-fit bumper endings first, no sanding or cutting |
| 2018–2023 | Mustang S550 Facelift | ❌ Different kit | Uses a different front fascia and requires the facelift version |
| 2005–2014 | Mustang S197 | ❌ Different kit | Designed for a different Mustang generation |
Open the box. Lay every panel around the car. Take a step back. That photo is the first memory of your build.
Complete specifications, compatibility notes and additional product information.
Vehicle-specific 2015–2017 Ford Mustang S550 pre-facelift widebody kit: plug-and-play fitment without weeks of sanding and cutting.
SHIROKAI S550 in the press:
See all SHIROKAI builds in the press
The SHIROKAI 2015–2017 Mustang S550 Widebody Kit is engineered for the pre-facelift Ford Mustang S550 platform, giving GT and EcoBoost builds real width, stronger presence, and more room for an aggressive wheel and tire setup — while still following the factory body lines.
Fits 2015, 2016, 2017 Mustang GT/EcoBoost (pre-facelift S550).
This is not just an overfenders 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 signature Kaiju stance and keeps every line looking intentional.
2015–2017 (pre-facelift): sharp three-piece LED headlights with the vertical “gills”, flat hood with no vents, taller front bumper opening. 2018–2023 (facelift): slimmer lower-set headlights with tri-bar LED DRLs, hood with twin heat extractor vents, lower and wider bumper grille.
Have a 2018, 2019, 2020, 2021, 2022 or 2023 Mustang? See the 2018–2023 S550 widebody kit →
Looking for build ideas? See real cars in our widebody Mustang S550 gallery.
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.
Confirmed fitment for 2015, 2016 and 2017 Ford Mustang:
| Year | Model | Fitment | Notes |
|---|---|---|---|
| 2015–2017 | Mustang GT | ✅ Direct fit | Vehicle-specific fit; test fitting and drilling are required |
| 2015–2017 | Mustang EcoBoost | ✅ Direct fit | Vehicle-specific fit; test fitting and drilling are required |
| 2015–2017 | Mustang Convertible | ⚠️ Partial fit | Kit fits, ducktail spoiler excluded (different trunk lid) |
| 2015–2017 | Shelby GT350 & non-GT bumpers | 🔧 Bumper check | Different front bumper: test-fit bumper endings first, no sanding or cutting |
| 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.
| 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 | 180 mm total at the front; 220 mm total at the rear |
| Components | Kit components: front flares (2), rear flares (2), side skirts (2), bumper endings, front lip spoiler; ducktail spoiler only in the full-kit configuration |
| Mounting | Plug-and-play fitment on GT/EcoBoost — no weeks of sanding or cutting. Rivnut mounting; mounting hardware not included (sold separately) |
| Install time | 1–3 days at a body shop, excluding paint/wrap |
| 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 (bumper check) |
| Country of manufacture | Turkey (Bursa) |
| Catalog status | Best-selling Mustang widebody kit |
| Support | Lifetime tech support from manufacturer |
All you need is steady hands and a heat gun — the kit is plug-and-play on GT/EcoBoost, with no weeks of sanding or cutting. 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.
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 →
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.
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.
The GT350 uses a different front bumper than the standard GT, so we recommend a quick test fit of the bumper endings before install. No sanding or cutting of the flares, skirts or spoiler; all other panels fit identically to the GT.
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.
The S550 kit adds 180 mm of total width at the front and 220 mm at the rear (9 cm front and 11 cm rear per side). Our S197 kits add 180 mm total at the front and 240 mm at the rear (9 cm front and 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.
Typical body shop install takes 1–3 days (excluding paint/wrap), 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.
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.
The 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.
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