{"product_id":"project-mu-fs44s-forged-4-piston-slim-front-brake-kit-355mm-2-piece-rotors-2022-toyota-gr86-zn8-subaru-brz-zd8","title":"Project Mu FS44S Forged 4-Piston Slim Front Brake Kit (355mm 2-Piece Rotors) 2013+ FRS\/BRZ\/86 2022+ BRZ\/GR86","description":"\u003cp style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0273\/1491\/files\/download_89a23d83-7a50-4507-9890-c1ec4e9d0b4d.png?v=1760034359\" alt=\"Project Mu Banner\" style=\"display: block; margin-left: auto; margin-right: auto; max-width: 100%; height: auto;\"\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eOVERVIEW\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003eCombine high-output multi-piston stopping power with maximum wheel clearance using the Project Mu FS44S Forged 4-Piston Slim Front Brake Kit for the 2022+ Toyota GR86, Subaru BRZ, and Toyota 86. Built with a slimmed caliper profile (140.2mm overall width), the FS44S is specifically engineered to eliminate wheel spoke interference commonly found on aggressive aftermarket and concave wheel fitments. Utilizing a unique 4-piston x 4-pad system, each piston acts independently on its own dedicated pad, ensuring uniform wear across the friction surface, eliminating pad taper, and producing instantaneous pedal response under heavy braking.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- 4-PRODUCT COMPARISON TABLE --\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; text-align: left;\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"padding: 8px;\"\u003eCaliper Feature \/ Spec\u003c\/th\u003e\n\u003cth style=\"padding: 8px;\"\u003e\u003cstrong\u003eFS4M Street 4POT (Kit FS4M-F103SP)\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"padding: 8px;\"\u003e\u003cstrong\u003eFS44S Sports 4POT (Kit FS44S-F103)\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003eFS44S Sports 4POT (Kit FS44S-F103B)\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"padding: 8px;\"\u003e\u003cstrong\u003eFS44 Standard 4POT (Kit FS44-F103A)\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eAxle Position\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eFront Axle Specific\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eFront Axle Specific\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003eFront Axle Specific\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eFront Axle Specific\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eCaliper Profile \/ Design\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eSlim Street Body (17\" Wheel Friendly)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eSlim Body (High Wheel Clearance)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003eSlim Body (High Wheel Clearance)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eStandard Full-Size Forged Body\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003ePiston \/ Pad Architecture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e4-Pistons x 2-Pads (Standard)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e4-Pistons x 4-Pads (1 Pad \/ Piston)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003e4-Pistons x 4-Pads (1 Pad \/ Piston)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e4-Pistons x 4-Pads (1 Pad \/ Piston)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eRotor Spec \/ Design\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e315mm x 30mm (1-Piece Round 6-Slit)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e332mm x 28mm (2-Piece Straight 8-Slit)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003e355mm x 28mm (2-Piece Straight 8-Slit)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e345mm x 32mm (2-Piece Straight 8-Slit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eTarget Application\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eEntry Street Upgrade \/ OEM 17\" Wheels\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eHigh-Clearance Street \u0026amp; Track (17\"\/18\")\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003eHigh-Clearance Street \u0026amp; Track (18\"+ Wheels)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eHeavy-Duty Trackday \u0026amp; Circuit Use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eFEATURES\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eSlim Caliper Architecture:\u003c\/strong\u003e Slimmed body design minimizes outer caliper protrusion, maximizing clearance with aftermarket concave spokes.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e4-Piston x 4-Pad Technology:\u003c\/strong\u003e Equips each of the four 38mm pistons with an individual brake pad to prevent pad tapering, optimize heat distribution, and increase initial bite control.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eForged Aluminum Body Construction:\u003c\/strong\u003e Forged aluminum alloy provides exceptional structural rigidity while resisting body flex under aggressive track loads.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eMassive 355mm 2-Piece Rotors:\u003c\/strong\u003e Oversized 355x28mm 2-piece floating rotors increase thermal heat capacity and braking torque over stock discs.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eStraight 8-Slit Rotor Venting:\u003c\/strong\u003e 8-slit pattern continuously cleans the brake pad face and vents out boundary layer gases during high-temperature braking.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eIconic Project Mu Teal Finish:\u003c\/strong\u003e Features Project Mu's signature teal powder coating over a hard-anodized protective base coat for severe corrosion resistance.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eWHAT IS INCLUDED\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e2x Project Mu FS44S Forged 4-Piston Slim Front Calipers (Signature Teal Powder Coat)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e2x Project Mu 355mm x 28mm 2-Piece Front Brake Rotors (Straight 8-Slit)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e8x Project Mu Performance Front Brake Pads (4 Pads per Caliper - Standard NS-C Compound)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e2x CNC Machined Aluminum Caliper Mounting Brackets \u0026amp; Hardware\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e2x Stainless Steel Braided Brake Lines with Teflon Inner Core\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003ePad Support Springs \u0026amp; Installation Bolt Kit\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003ePART NUMBERS\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e FS44S-F103B\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eSPECIFICATIONS\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003ePosition:\u003c\/strong\u003e Front Axle\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eCaliper Type:\u003c\/strong\u003e Forged Aluminum 4-Piston Slim (FS44S)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003ePiston Diameter:\u003c\/strong\u003e 38mm x 4\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eCaliper Dimensions:\u003c\/strong\u003e Length: 282.8mm | Width: 140.2mm | Height: 72.3mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eRotor Dimensions:\u003c\/strong\u003e 355mm Diameter x 28mm Thickness (2-Piece Floating)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eRotor Venting \/ Slits:\u003c\/strong\u003e Vented with Straight 8-Slit Pattern\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eStandard Included Compound:\u003c\/strong\u003e Project Mu NS-C (Optional: TYPE PS or D1 spec ZERO)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eFinish:\u003c\/strong\u003e Hard Anodized + Signature Teal Powder Coat\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eFITMENT\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e2022+ Toyota GR86 (ZN8) - Requires 18-inch wheels or larger\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e2022+ Subaru BRZ (ZD8) - Requires 18-inch wheels or larger\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" style=\"font-weight: bold;\"\u003e\u003cstrong\u003e2013-2021 Toyota 86 \/ Scion FR-S (ZN6) - Requires 18-inch wheels or larger\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eDISCLAIMER\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eBackplate Processing Required:\u003c\/strong\u003e Installation requires trimming or modifying the OEM front brake disc dust shields\/backplates.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eNon-Affiliation \u0026amp; Warranty:\u003c\/strong\u003e Direct parallel import of authentic JDM components. We are an independent retailer, not an authorized Project Mu dealer. Factory warranty applies in Japan only.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e14-Day Defect Window:\u003c\/strong\u003e Customers must inspect all parts upon arrival. Defect, damage, or missing part claims must be reported within 14 days of delivery and prior to installation. Installed items are non-returnable.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eInstallation:\u003c\/strong\u003e Manuals are in Japanese. Professional installation by a certified technician is required.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Project Mu","offers":[{"title":"Default Title","offer_id":48574270439636,"sku":"FS44S-F103B","price":3495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0273\/1491\/files\/photo_cali_f4x4slim_800x_a896c6e9-22b2-48e6-9790-c13a2932e0bb.jpg?v=1787923752","url":"https:\/\/shop.battlegarage-rs.com\/products\/project-mu-fs44s-forged-4-piston-slim-front-brake-kit-355mm-2-piece-rotors-2022-toyota-gr86-zn8-subaru-brz-zd8","provider":"Battle Garage Racing Service","version":"1.0","type":"link"}