{"product_id":"csr-grimmspeed-4-piston-brake-caliper-kit-for-02-21-wrx-sti-326mm-rotor","title":"GrimmSpeed 4-Piston Brake Caliper Kit For 2002-2021 Subaru WRX\/STI (326mm Rotor)","description":"\u003cp\u003e\u003cstrong\u003eGRM.1169.1.GRY \/ GRM.1169.1.RED - GrimmSpeed 4-Piston Brake Caliper Kit For 2002-2021 Subaru WRX\/STI (326mm Rotor)\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe stock single-piston caliper found on most Subaru platforms gets the job done — but it wasn’t designed for the kind of aggressive driving, tracking, or build evolution most GrimmSpeed drivers pursue. That’s where our \u003cstrong\u003e4-Piston Brake Caliper Kit\u003c\/strong\u003e comes in.\u003c\/p\u003e\n\u003cp\u003ePurpose-built for Subaru performance, this fixed caliper setup brings balanced stopping power, improved heat management, and consistent pedal feel to your favorite chassis. Designed in-house and tested under real-world conditions, the system offers a true performance solution — with no need to chase down used Brembos or deal with custom brackets.\u003c\/p\u003e\n\u003cp\u003eEach kit is application-specific, pairing our forged aluminum calipers with the correct rotor and bracket configuration for your setup. Calipers are available in your choice of \u003cstrong\u003eRed\u003c\/strong\u003e or \u003cstrong\u003eGunmetal Gray anodized finishes\u003c\/strong\u003e, both designed to withstand heat and resist corrosion while delivering a clean, motorsports-ready look. From street builds to track cars, this is the braking confidence your Subaru deserves.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eForged 6061-T6 Aluminum Caliper Body\u003c\/strong\u003e – 2-piece design, hard anodized for strength and corrosion resistance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDual Piston Setup\u003c\/strong\u003e – 44mm primary and 41mm secondary pistons provide even pad pressure and reduced taper\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHeat-Managed Pistons\u003c\/strong\u003e – Type 3 hard anodized and vented for superior thermal performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLightweight Design\u003c\/strong\u003e – Approximately 9.9 lbs per corner with bracket and hardware\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePad Compatibility\u003c\/strong\u003e – FMSI D1001 or D968 (varies by application)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRotor Compatibility\u003c\/strong\u003e – Works with commonly available Subaru OEM and STI rotors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNo Brake Lines Required\u003c\/strong\u003e – Compatible with factory lines (new lines may be recommended depending on vehicle)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat’s Included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e(2) GrimmSpeed 4-Piston Brake Calipers (choose Red or Gunmetal)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e(2) Vehicle-Specific Billet 4140 Steel Caliper Brackets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFull Hardware Kit:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eBridge bolts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBanjo bolts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCrush washers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBleeder dust caps\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCaliper guide pins\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSecurity cotter pins\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCaliper spring bridges + bolts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/WRX_STI_BRZ_326_Rotor_Wheel_Clearance_Template.pdf?v=1753977099\"\u003ePrintable 1:1 Fitment Template\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInstall Instructions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e02-21 WRX\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e04-21 STI\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eRotor Size: 326mm\u003c\/li\u003e\n\u003cli\u003ePad Type: F50 (FMSI D1001)\u003c\/li\u003e\n\u003cli\u003eDesigned for use with OEM-style hubs and rotors — no knuckle swaps or custom adapters required.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003e *OEM - 5x100 - 326mm x 30mm Rotor - Also came on some BRZ (5x100 Cars Only) Pre-2015 WRX\/STI Part No.-26300FE001\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e *OEM 5x114.3 - 326mm x 30mm Rotor - Fit 4 pot Brembos (5x114.3 Cars Only) 2015+ WRX\/STI Part No.-26300FE070\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/GRM11341-2.XXX_GrimmSpeedBigBrake_Kit_InstallGuide_V3.pdf?v=1755726404\"\u003e\u003cstrong\u003e\u003cem\u003eINSTALLATION GUIDE\u003c\/em\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/h2\u003e\u003ch3\u003eOptions and Part Numbers\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eOption\u003c\/th\u003e\n\u003cth\u003ePart number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGunmetal Gray\u003c\/td\u003e\n\u003ctd\u003eGRM.1169.1.GRY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRed\u003c\/td\u003e\n\u003ctd\u003eGRM.1169.1.RED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eCircuit Spec R offers Free Shipping within the contiguous US. Confirm the vehicle application and selected options before ordering.\u003c\/p\u003e","brand":"GrimmSpeed","offers":[{"title":"Gunmetal Gray","offer_id":67722158178611,"sku":null,"price":1542.8,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":67722158211379,"sku":null,"price":1542.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0256\/5855\/6497\/files\/grimmspeed-inventory-20261015-1259.jpg?v=1792124996","url":"https:\/\/www.circuitspecr.com\/products\/csr-grimmspeed-4-piston-brake-caliper-kit-for-02-21-wrx-sti-326mm-rotor","provider":"Circuit Spec R","version":"1.0","type":"link"}