{"product_id":"ford-mustang-widebody-kit-2015-2017-gt-s550-shirokai","title":"Ford Mustang Widebody Kit | 2015-2017 GT S550 | SHIROKAI","description":"\u003ch2\u003eKit at a glance\u003c\/h2\u003e\n\u003cp\u003eVehicle-specific 2015–2017 Ford Mustang S550 pre-facelift widebody kit: plug-and-play fitment without weeks of sanding and cutting.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 2015, 2016, 2017 Ford Mustang (S550 pre-facelift). GT and EcoBoost: direct fit. Convertible: kit fits, ducktail spoiler excluded (different trunk lid). 2015–2017 Shelby GT350 \u0026amp; non-GT bumpers: different front bumper, test-fit the bumper endings first (no sanding or cutting). Not for 2018–2023 facelift cars (separate \u003ca href=\"\/products\/shirokai-ford-mustang-s550-gt-18-widebody-kit-s550-2018-2023\"\u003e2018–2023 kit\u003c\/a\u003e).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 3.5 mm automotive-grade ABS plastic — thick enough for durability, light enough to keep weight down. CNC-cut from vehicle-specific 3D scan data. Black in mass, wrap-ready.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdded width:\u003c\/strong\u003e front +3.54 in (90 mm) per side, rear +4.33 in (110 mm) per side.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParts included:\u003c\/strong\u003e front fender flares (2), rear fender flares (2), side skirts (2), bumper endings, front lip spoiler.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDucktail spoiler:\u003c\/strong\u003e included only in the “Full kit with ducktail spoiler” configuration; also sold separately as the \u003ca href=\"\/products\/shirokai-ford-mustang-s550-ducktail-spoiler-s550-2015-2022\"\u003eS550 Ducktail Spoiler\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting hardware:\u003c\/strong\u003e not included, sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModifications needed:\u003c\/strong\u003e Direct fit on GT\/EcoBoost, no weeks of sanding or cutting. 2015–2017 GT350 and non-GT bumpers: test-fit the bumper endings first, no sanding or cutting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation time:\u003c\/strong\u003e 1–3 days at a body shop, excluding paint\/wrap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWheels \u0026amp; tires:\u003c\/strong\u003e typically 19x10 wheels with 275–285 mm tires front and 19x11 or 20x11 wheels with 295–315 mm tires rear, depending on offset.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePaint prep:\u003c\/strong\u003e light sanding and primer recommended before paint.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in:\u003c\/strong\u003e Bursa, Turkey.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSHIROKAI S550 in the press:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUK magazine Stance Auto featured Kez Martin's 2016 Mustang GT on this SHIROKAI S550 widebody kit, with air suspension, in February 2021: \u003ca href=\"https:\/\/stanceauto.co.uk\/kez-martin-2016-shirokai-mustang-gt\" rel=\"noopener\" target=\"_blank\"\u003eStance Auto: Kez Martin - 2016 Shirokai Mustang GT\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/wide-body-kits-database\/shirokai-builds-in-the-press\"\u003eSee all SHIROKAI builds in the press\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eSHIROKAI 2015–2017 Mustang S550 Widebody Kit\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFits 2015, 2016, 2017 Mustang GT\/EcoBoost (pre-facelift S550).\u003c\/strong\u003e\u003c\/p\u003e\n\n\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\n\u003ch2\u003eFord Mustang S550 (2015-2017) Widebody Kit — Quick Facts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 2015–2017 Mustang GT and EcoBoost (plug-and-play), Convertible kit-only (spoiler excluded), Shelby GT350 with a bumper check (test-fit first)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Automotive-grade ABS plastic, 3D-scanned and CNC-cut from OEM body\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth added:\u003c\/strong\u003e +3.54 in (9 cm) per side front, +4.33 in (11 cm) per side rear — 180 mm total at the front and 220 mm total at the rear\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall:\u003c\/strong\u003e 1–3 days at a body shop (excluding paint\/wrap), plug-and-play for 2015–2017 GT\/EcoBoost with stock bumper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Front flares, rear flares, side skirts, bumper endings, front lip spoiler; rear ducktail spoiler only with the “Full kit with ducktail spoiler” configuration. Mounting hardware is sold separately\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e See the current price for your selected configuration above.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStatus:\u003c\/strong\u003e SHIROKAI's most popular Mustang platform, with strong owner community across US, EU, and Asia\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping:\u003c\/strong\u003e Worldwide delivery. Shipping is calculated for your address in your selected currency at checkout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat’s in the Ford Mustang S550 Widebody Kit\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eFront fender flares\u003c\/li\u003e\n  \u003cli\u003eRear fender flares\u003c\/li\u003e\n  \u003cli\u003eSide skirts\u003c\/li\u003e\n  \u003cli\u003eBumper fender endings\u003c\/li\u003e\n  \u003cli\u003eFront lip spoiler\u003c\/li\u003e\n  \u003cli\u003eRear trunk spoiler — only with the “Full kit with ducktail spoiler” configuration\u003c\/li\u003e\n\u003cli\u003eMounting hardware is sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eNot your year? 2015–2017 vs 2018–2023 — how to tell\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003e2015–2017 (pre-facelift):\u003c\/strong\u003e sharp three-piece LED headlights with the vertical “gills”, flat hood with no vents, taller front bumper opening. \u003cstrong\u003e2018–2023 (facelift):\u003c\/strong\u003e slimmer lower-set headlights with tri-bar LED DRLs, hood with twin heat extractor vents, lower and wider bumper grille.\u003c\/p\u003e\u003cp\u003eHave a 2018, 2019, 2020, 2021, 2022 or 2023 Mustang? \u003ca href=\"\/products\/shirokai-ford-mustang-s550-gt-18-widebody-kit-s550-2018-2023\"\u003eSee the 2018–2023 S550 widebody kit →\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003eLooking for build ideas? See real cars in our \u003ca href=\"\/blogs\/wide-body-kits-database\/widebody-mustang-s550-gallery\"\u003ewidebody Mustang S550 gallery\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eWidth \u0026amp; Specs\u003c\/h2\u003e\n\u003cp\u003eFront fenders add \u003cstrong\u003e3.54 in (9 cm) per side\u003c\/strong\u003e, rear fenders add \u003cstrong\u003e4.33 in (11 cm) per side\u003c\/strong\u003e, measured from the stock arch — room for an aggressive wheel and tire setup.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh-grade automotive ABS plastic\u003c\/li\u003e\n  \u003cli\u003eBlack in mass — wrappable straight out of the box (light sanding + primer recommended for best paint result)\u003c\/li\u003e\n  \u003cli\u003eVehicle-specific panels; professional test fitting and installation recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFord Mustang S550 Widebody Kit Fitment Guide (2015–2017)\u003c\/h2\u003e\n\u003cp\u003eConfirmed fitment for \u003cstrong\u003e2015, 2016 and 2017 Ford Mustang\u003c\/strong\u003e:\u003c\/p\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFitment\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2015–2017\u003c\/td\u003e\n\u003ctd\u003eMustang GT\u003c\/td\u003e\n\u003ctd\u003e✅ Direct fit\u003c\/td\u003e\n\u003ctd\u003eVehicle-specific fit; test fitting and drilling are required\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2015–2017\u003c\/td\u003e\n\u003ctd\u003eMustang EcoBoost\u003c\/td\u003e\n\u003ctd\u003e✅ Direct fit\u003c\/td\u003e\n\u003ctd\u003eVehicle-specific fit; test fitting and drilling are required\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2015–2017\u003c\/td\u003e\n\u003ctd\u003eMustang Convertible\u003c\/td\u003e\n\u003ctd\u003e⚠️ Partial fit\u003c\/td\u003e\n\u003ctd\u003eKit fits, ducktail spoiler excluded (different trunk lid)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2015–2017\u003c\/td\u003e\n\u003ctd\u003eShelby GT350 \u0026amp; non-GT bumpers\u003c\/td\u003e\n\u003ctd\u003e🔧 Bumper check\u003c\/td\u003e\n\u003ctd\u003eDifferent front bumper: test-fit bumper endings first, no sanding or cutting\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2018–2023\u003c\/td\u003e\n\u003ctd\u003eMustang S550 facelift\u003c\/td\u003e\n\u003ctd\u003e❌ Different kit\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/shirokai-ford-mustang-s550-gt-18-widebody-kit-s550-2018-2023\"\u003eSee the S550 2018–2023 kit →\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2005–2014\u003c\/td\u003e\n\u003ctd\u003eMustang S197\u003c\/td\u003e\n\u003ctd\u003e❌ Different kit\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/shirokai-mustang-s197-widebody\"\u003eSee the S197 widebody kit →\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eNot sure about your trim? Email \u003ca href=\"mailto:i@shirok.ai\"\u003ei@shirok.ai\u003c\/a\u003e — we confirm fitment within 24h.\u003c\/p\u003e\n\n\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAutomotive-grade ABS plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturing\u003c\/td\u003e\n\u003ctd\u003eCNC-cut from OEM 3D scan data\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront flare width\u003c\/td\u003e\n\u003ctd\u003e+3.54 in \/ +9 cm per side\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear flare width\u003c\/td\u003e\n\u003ctd\u003e+4.33 in \/ +11 cm per side\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal added width\u003c\/td\u003e\n\u003ctd\u003e180 mm total at the front; 220 mm total at the rear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComponents\u003c\/td\u003e\n\u003ctd\u003eKit components: front flares (2), rear flares (2), side skirts (2), bumper endings, front lip spoiler; ducktail spoiler only in the full-kit configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003ePlug-and-play fitment on GT\/EcoBoost — no weeks of sanding or cutting. Rivnut mounting; mounting hardware not included (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstall time\u003c\/td\u003e\n\u003ctd\u003e1–3 days at a body shop, excluding paint\/wrap\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePaint prep\u003c\/td\u003e\n\u003ctd\u003eLight sanding + primer recommended for best finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWrap compatibility\u003c\/td\u003e\n\u003ctd\u003eYes, surface ready out of the box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible vehicles\u003c\/td\u003e\n\u003ctd\u003e2015–2017 Mustang GT\/EcoBoost (plug-and-play), Convertible (kit-only), Shelby GT350 (bumper check)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of manufacture\u003c\/td\u003e\n\u003ctd\u003eTurkey (Bursa)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCatalog status\u003c\/td\u003e\n\u003ctd\u003eBest-selling Mustang widebody kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003eLifetime tech support from manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003e2015–2017 Mustang S550 Widebody Kit by SHIROKAI\u003c\/h2\u003e\n\u003cp\u003eAll 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 \u003cstrong\u003ewide body S550\u003c\/strong\u003e setup gives your car a powerful, planted stance.\u003c\/p\u003e\n\n\u003ch2\u003eWheels \u0026amp; Tires\u003c\/h2\u003e\n\u003cp\u003eDial in your exact setup with our \u003ca href=\"\/pages\/wheel-fitment-calculator\"\u003eWidebody Wheel Fitment Calculator\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWant to test our quality first?\u003c\/strong\u003e The ducktail spoiler is included in the full kit, and also sold separately (works with both pre-facelift and facelift cars). \u003ca href=\"https:\/\/shirok.ai\/products\/shirokai-ford-mustang-s550-ducktail-spoiler-s550-2015-2022\"\u003eSee the S550 Ducktail Spoiler →\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch2\u003eFinishing\u003c\/h2\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eWill this kit work on my Mustang Convertible?\u003c\/h3\u003e\n\u003cp\u003ePartially. 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.\u003c\/p\u003e\n\n\u003ch3\u003eWhat about Shelby GT350 fitment?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch3\u003eIs this kit different from the 2018–2023 S550 kit?\u003c\/h3\u003e\n\u003cp\u003eYes. 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, \u003ca href=\"https:\/\/shirok.ai\/products\/shirokai-ford-mustang-s550-gt-18-widebody-kit-s550-2018-2023\"\u003esee our S550 2018–2023 widebody kit\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the width compare to other SHIROKAI Mustang kits?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch3\u003eHow long does installation take?\u003c\/h3\u003e\n\u003cp\u003eTypical 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.\u003c\/p\u003e\n\n\u003ch3\u003eWill my doors still open with the flares installed?\u003c\/h3\u003e\n\u003cp\u003eYes. 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.\u003c\/p\u003e\n\n\u003ch3\u003eWhat wheel and tire setup works with this kit?\u003c\/h3\u003e\n\u003cp\u003eThe 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 \u003ca href=\"https:\/\/shirok.ai\/pages\/wheel-fitment-calculator\"\u003eWidebody Wheel Fitment Calculator\u003c\/a\u003e for precise sizing tailored to this kit.\u003c\/p\u003e","brand":"SHIROKAI - WIDEBODY KITS THAT FIT","offers":[{"title":"Kit without spoiler","offer_id":67830657351862,"sku":"S550.1517.WBNS","price":5060.0,"currency_code":"USD","in_stock":true},{"title":"Full kit with ducktail spoiler","offer_id":67830657384630,"sku":"S550.1517.WBF","price":5490.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0241\/4133\/2557\/files\/s550.jpg?v=1793037006","url":"https:\/\/merrickmotorsports.com\/products\/ford-mustang-widebody-kit-2015-2017-gt-s550-shirokai","provider":"Merrick Motorsports","version":"1.0","type":"link"}