{"product_id":"hks-hipermax-s-coilovers-2013-lexus-gs450h-grl10","title":"HKS Hipermax S Coilovers for 2013+ Lexus GS450h RWD (GRL10)","description":"\u003cp\u003eHKS Hipermax S coilovers for the 2013+ Lexus GS450h RWD (GRL10) are engineered for drivers who want genuine performance gains without giving up daily-driver comfort. Built around HKS's FLAT RIDE CONCEPT, the Hipermax S smooths out low-speed harshness while keeping the Lexus GS450h RWD planted under hard cornering — delivering the refined, controlled ride quality that makes a coilover worth owning on the street.\u003c\/p\u003e\n\u003cp\u003e30-level damping adjustment, a large-diameter monotube damper, Dual PVS, and DURA BOOTS give the Hipermax S its signature mix of long-life durability and tunability. Length-adjustable shock bodies let you lower the Lexus GS450h RWD without pre-loading the spring, and every kit is backed by HKS's class-leading 3-year \/ 60,000 km warranty — validated over 60,000 km of real-world testing before it ever leaves Japan.\u003c\/p\u003e\n\u003ch5\u003eFeatures\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eMonotube damper construction — separates gas\/oil for stable damping under heat\u003c\/li\u003e\n\u003cli\u003e30-level damping adjustment via the WR Needle valve system\u003c\/li\u003e\n\u003cli\u003eFLAT RIDE CONCEPT tuning — absorbs low-speed road harshness, controls body roll\u003c\/li\u003e\n\u003cli\u003eDual Preload Valve System (Dual PVS) — tuned per chassis\u003c\/li\u003e\n\u003cli\u003eDURA BOOTS — new-spec dust boots with improved heat, weather, and ozone resistance\u003c\/li\u003e\n\u003cli\u003eAdvanced Bump Rubber Plus — progressive, early engagement\u003c\/li\u003e\n\u003cli\u003eReinforced rubber upper mounts (pillowball optional on select SKUs)\u003c\/li\u003e\n\u003cli\u003eHKS in-house cold-formed springs with printed spring rates\u003c\/li\u003e\n\u003cli\u003ePNE corrosion coating on threaded surfaces\u003c\/li\u003e\n\u003cli\u003eLength-adjustable shock body — preload-independent height adjustment\u003c\/li\u003e\n\u003cli\u003e3-year \/ 60,000 km warranty (validated through real-world driving)\u003c\/li\u003e\n\u003cli\u003eRebuildable — dust boots and stabilizer links now covered\u003c\/li\u003e\n\u003cli\u003eMade in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003ctable class=\"table table-striped table-primary\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e80300-AT005\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Name\u003c\/td\u003e\n\u003ctd\u003eHKS Hipermax S Coilovers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle\u003c\/td\u003e\n\u003ctd\u003e2013+ Lexus GS450h RWD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis Code\u003c\/td\u003e\n\u003ctd\u003eGRL10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDamping Adjustment\u003c\/td\u003e\n\u003ctd\u003e30-Level 1-Way\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight Adjustable\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring Rate - Front\u003c\/td\u003e\n\u003ctd\u003e8.0 Kg\/mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring Rate - Rear\u003c\/td\u003e\n\u003ctd\u003e10.0 Kg\/mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring Length - Front\u003c\/td\u003e\n\u003ctd\u003e250mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring Length - Rear\u003c\/td\u003e\n\u003ctd\u003e220mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpper Mount - Front\u003c\/td\u003e\n\u003ctd\u003eRubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpper Mount - Rear\u003c\/td\u003e\n\u003ctd\u003eRubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRide Height Range - Front\u003c\/td\u003e\n\u003ctd\u003e-38mm (0mm to -70mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRide Height Range - Rear\u003c\/td\u003e\n\u003ctd\u003e-45mm (-32mm to -81mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e3-year \/ 60,000 km\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eImportant Fitment Notes\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eRide height data based on GRL10\u003c\/li\u003e\n\u003cli\u003eWhen ordering, change rear springs from 10K-220 to 12K-220\u003c\/li\u003e\n\u003cli\u003eWhen ordering, change rear springs from 10K-220 to 12K-220. Confirmed on GS450h F Sport\u003c\/li\u003e\n\u003cli\u003eConfirmed on RC350 F Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eVehicle Fitment\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e2013 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2014 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2015 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2016 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2017 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2018 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2019 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2020 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2021 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2022 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2023 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2024 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2025 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003cli\u003e2026 Lexus GS450h RWD (GRL10)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HKS","offers":[{"title":"Default Title","offer_id":40191086886972,"sku":"80300-AT005","price":2290.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0000\/2183\/products\/hks-hipermax-s-coilovers-for-2013-lexus-gs450h-rwd-grl10-80300-at005-1194331785.jpg?v=1761538091","url":"https:\/\/www.springrates.com\/products\/hks-hipermax-s-coilovers-2013-lexus-gs450h-grl10","provider":"SPRINGRATES®","version":"1.0","type":"link"}