{"product_id":"grimmspeed-4-piston-brake-caliper-kit-326mm-rotor-gunmetal-gray-2002-2021-subaru-wrx-sti","title":"GrimmSpeed 4-Piston Brake Caliper Kit (326mm Rotor) - Gunmetal Gray - 2002-2021 Subaru WRX \/ STI","description":"\u003ch2 class=\"mb-2 mt-4 font-display font-semimedium text-base first:mt-0\"\u003e\u003cstrong\u003eDesigned for Performance\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:pb-2\"\u003eThe stock single-piston caliper on most Subaru models performs adequately but isn’t engineered for the aggressive driving, track days, or extensive builds that many Subaru enthusiasts pursue. The GrimmSpeed 4-Piston Brake Caliper Kit addresses this gap with a purpose-built, fixed caliper setup specifically designed for Subaru performance. It delivers balanced stopping power, enhanced heat management, and consistent pedal feel to improve braking reliability and driver confidence. Developed and tested in-house under real-world conditions, this system offers a genuine performance upgrade without the hassle of sourcing used Brembos or fabricating custom brackets.\u003c\/p\u003e\n\u003cp class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:pb-2\"\u003e \u003c\/p\u003e\n\u003ch2 class=\"mb-2 mt-4 font-display font-semimedium text-base first:mt-0\"\u003e\u003cstrong\u003eComplete Application-Specific Kits\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:pb-2\"\u003eEach GrimmSpeed brake kit is tailored to fit your specific Subaru application, pairing forged aluminum calipers with the appropriate rotor and bracket assemblies. Calipers come in your choice of Red or Gunmetal Gray anodized finishes, both resistant to heat and corrosion, while delivering a clean, motorsports-inspired appearance. This kit suits a wide range of builds from street-driven vehicles to dedicated track cars, providing the braking performance and confidence that Subaru drivers deserve.\u003c\/p\u003e\n\u003cp data-start=\"971\" data-end=\"1380\"\u003e \u003c\/p\u003e\n\u003ch3 data-start=\"1387\" data-end=\"1410\"\u003e\u003cstrong data-start=\"1394\" data-end=\"1410\"\u003eDETAILS:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"1411\" data-end=\"2092\"\u003e\n\u003cli data-start=\"1411\" data-end=\"1525\"\u003e\n\u003cp data-start=\"1413\" data-end=\"1525\"\u003e\u003cstrong data-start=\"1413\" data-end=\"1453\"\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 data-start=\"1526\" data-end=\"1637\"\u003e\n\u003cp data-start=\"1528\" data-end=\"1637\"\u003e\u003cstrong data-start=\"1528\" data-end=\"1549\"\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 data-start=\"1638\" data-end=\"1733\"\u003e\n\u003cp data-start=\"1640\" data-end=\"1733\"\u003e\u003cstrong data-start=\"1640\" data-end=\"1664\"\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 data-start=\"1734\" data-end=\"1821\"\u003e\n\u003cp data-start=\"1736\" data-end=\"1821\"\u003e\u003cstrong data-start=\"1736\" data-end=\"1758\"\u003eLightweight Design\u003c\/strong\u003e – Approximately 9.9 lbs per corner with bracket and hardware\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1822\" data-end=\"1892\"\u003e\n\u003cp data-start=\"1824\" data-end=\"1892\"\u003e\u003cstrong data-start=\"1824\" data-end=\"1845\"\u003ePad Compatibility\u003c\/strong\u003e – FMSI D1001 or D968 (varies by application)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1893\" data-end=\"1978\"\u003e\n\u003cp data-start=\"1895\" data-end=\"1978\"\u003e\u003cstrong data-start=\"1895\" data-end=\"1918\"\u003eRotor Compatibility\u003c\/strong\u003e – Works with commonly available Subaru OEM and STI rotors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1979\" data-end=\"2092\"\u003e\n\u003cp data-start=\"1981\" data-end=\"2092\"\u003e\u003cstrong data-start=\"1981\" data-end=\"2008\"\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 data-start=\"2099\" data-end=\"2125\"\u003e\u003cstrong data-start=\"2106\" data-end=\"2125\"\u003eWhat’s Included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"2126\" data-end=\"2502\"\u003e\n\u003cli data-start=\"2126\" data-end=\"2193\"\u003e\n\u003cp data-start=\"2128\" data-end=\"2193\"\u003e(2) GrimmSpeed 4-Piston Brake Calipers (choose Red or Gunmetal)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2194\" data-end=\"2253\"\u003e\n\u003cp data-start=\"2196\" data-end=\"2253\"\u003e(2) Vehicle-Specific Billet 4140 Steel Caliper Brackets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2254\" data-end=\"2444\"\u003e\n\u003cp data-start=\"2256\" data-end=\"2274\"\u003eFull Hardware Kit:\u003c\/p\u003e\n\u003cul data-start=\"2277\" data-end=\"2444\"\u003e\n\u003cli data-start=\"2277\" data-end=\"2293\"\u003e\n\u003cp data-start=\"2279\" data-end=\"2293\"\u003eBridge bolts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2296\" data-end=\"2311\"\u003e\n\u003cp data-start=\"2298\" data-end=\"2311\"\u003eBanjo bolts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2314\" data-end=\"2331\"\u003e\n\u003cp data-start=\"2316\" data-end=\"2331\"\u003eCrush washers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2334\" data-end=\"2355\"\u003e\n\u003cp data-start=\"2336\" data-end=\"2355\"\u003eBleeder dust caps\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2358\" data-end=\"2380\"\u003e\n\u003cp data-start=\"2360\" data-end=\"2380\"\u003eCaliper guide pins\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2383\" data-end=\"2407\"\u003e\n\u003cp data-start=\"2385\" data-end=\"2407\"\u003eSecurity cotter pins\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2410\" data-end=\"2444\"\u003e\n\u003cp data-start=\"2412\" data-end=\"2444\"\u003eCaliper spring bridges + bolts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2445\" data-end=\"2479\"\u003e\n\u003cp data-start=\"2447\" data-end=\"2479\"\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 data-start=\"2480\" data-end=\"2502\"\u003e\n\u003cp data-start=\"2482\" data-end=\"2502\"\u003eInstall Instructions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"2527\" data-start=\"2509\"\u003e\u003cstrong data-end=\"2527\" data-start=\"2516\"\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 x 30mm - STI fitment rotor\u003c\/li\u003e\n\u003cli\u003ePad Type: \"F50\" or FMSI D1001 - OEM 4-Piston STI Brembo Pads\u003c\/li\u003e\n\u003cli\u003eDesigned for use with OEM-style hubs and rotors — no knuckle swaps or custom adapters required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e        \u003cem\u003e *OEM x-ref - 5x100 - 326mm x 30mm Rotor - 2004 STI - Also came on some BRZ (5x100 Cars Only) Part No.-26300FE001\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e         *OEM x-ref 5x114.3 - 326mm x 30mm Rotor - Fit 4 pot Brembos (5x114.3 Cars Only) 2005-2017 WRX\/STI   Part No.-26300FE070\u003c\/em\u003e\u003c\/p\u003e","brand":"GrimmSpeed","offers":[{"title":"Default Title","offer_id":47773253501028,"sku":"GRM113422.1112.1.0.GRAY-KIT","price":1299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0589\/8413\/6804\/files\/GrimmSpeedBrakeCaliperGrey_b8bfd1f7-e029-4f62-af16-019ab390e0c1.jpg?v=1769397664","url":"https:\/\/4thto5thautomotive.com\/products\/grimmspeed-4-piston-brake-caliper-kit-326mm-rotor-gunmetal-gray-2002-2021-subaru-wrx-sti","provider":"4thto5thAutomotive","version":"1.0","type":"link"}