{"product_id":"project-mu-fs44s-4pot-slim-front-bbk-332x28mm-zn6-zc6-zn8-zd8","title":"Project Mu FS44S 4POT Slim Front BBK 332x28mm for 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\u003eStrengthen front stopping capability and optimize wheel clearance with the Project Mu 4POT FS44S Slim Forged Front Caliper Kit for 2013+ GR86 \/ BRZ \/ 86 \/ FR-S (ZN6\/ZC6\/ZN8\/ZD8). Engineered specifically to eliminate wheel spoke interference, the FS44S features a narrowed forged aluminum caliper body measuring just 140.2mm in width. Built with a performance-oriented 4-piston x 4-pad layout (1 pad per piston), the kit synchronizes pad application to eliminate tapering and deliver exceptional pedal modulation. Paired with lightweight 332mm x 28mm 2-piece straight 8-slit floating rotors, this 332mm slim kit provides serious thermal endurance for street and track use while expanding fitment across popular 17-inch motorsport wheels.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\n\u003c!-- FRONT-TO-FRONT 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\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003eFS44S Slim 4POT (332mm)\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"padding: 8px;\"\u003e\u003cstrong\u003eFS44S Slim 4POT (355mm)\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"padding: 8px;\"\u003e\u003cstrong\u003eFS44 Full-Size 4POT (345mm)\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; 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\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 \u0026amp; Width\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eCompact Street Body (275.0mm L x 144.5mm W)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003eSlim Body (140.2mm Width - High Spoke Clearance)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eSlim Body (140.2mm Width - High Spoke Clearance)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eStandard Full Body (156.25mm Width - Heavy Duty)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003ePiston Diameter \/ Pad Layout\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e38mm Pistons x 4 (2-Pads per Caliper)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003e38mm Pistons x 4 (4-Pads per Caliper)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e38mm Pistons x 4 (4-Pads per Caliper)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e41mm Oversized Pistons x 4 (4-Pads per Caliper)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eRotor Specs \u0026amp; Thickness\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; background-color: #d9ead3;\"\u003e\u003cstrong\u003e332mm x 28mm (2-Piece Straight 8-Slit)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e355mm x 28mm (2-Piece Straight 8-Slit)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e345mm x 32mm Heavy-Duty (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;\"\u003eStreet Performance \/ Canyon \u0026amp; OEM 17\" Wheels\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003eStreet \u0026amp; Track with Tight 17\"+ Wheel Clearance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eStreet \u0026amp; Track with Tight 18\"+ Wheel Clearance\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eHeavy-Duty Circuit \/ Maximum Clamping Power\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 Forged Aluminum Caliper Profile:\u003c\/strong\u003e 140.2mm slim overall width minimizes outboard protrusion to maximize spoke clearance on concave and mesh wheels.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e4-Piston x 4-Pad Architecture:\u003c\/strong\u003e Uses 4 independent pads per caliper (1 pad per piston) to prevent uneven pad wear, eliminate tapering, and maintain a sharp pedal feel.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e332mm x 28mm 2-Piece Floating Rotors:\u003c\/strong\u003e Billet aluminum hat and vented outer rotor ring effectively isolate heat transfer and reduce unsprung rotating mass.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eStraight 8-Slit Face Venting:\u003c\/strong\u003e Continuously cleans pad surface debris, improves initial bite, and exhausts friction boundary gases.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eDual Dust Seal Barrier Structure:\u003c\/strong\u003e Features outer dust boots positioned forward of the internal fluid pressure seals to prevent contamination from brake dust and road grime.\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 Slim Forged 4-Piston Front Calipers (Signature Teal Finish)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e2x Project Mu 332mm 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; Complete Installation Hardware\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-F103\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 Profile (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 332mm 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) \u0026amp; Subaru BRZ (ZD8)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e2013-2021 Toyota 86 \/ Scion FR-S (ZN6) \u0026amp; Subaru BRZ (ZC6)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cem\u003e*Requires most 17-inch or larger aftermarket wheels (slim caliper design maximizes spoke clearance)\u003c\/em\u003e\u003c\/span\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 OEM front brake 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":48574723064020,"sku":"FS44S-F103","price":3595.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0273\/1491\/files\/Project_Mu_FS44S_4POT_Slim_Front_BBK_332x28mm_ZN6_ZC6_ZN8_ZD8.jpg?v=1787934589","url":"https:\/\/shop.battlegarage-rs.com\/products\/project-mu-fs44s-4pot-slim-front-bbk-332x28mm-zn6-zc6-zn8-zd8","provider":"Battle Garage Racing Service","version":"1.0","type":"link"}