Designed in Solidworks using 3D scanned models, this high temperature 3-ply reinforced black silicone radiator and heater hose kit (part number 57-1960-BLK) is the best fitting radiator and heater coolant hose kit on the market for 2001-2005 Lexus IS300 with 1JZ-GTE VVT-i from JZS170 Toyota Crown and IS300 OEM style radiator. Compare to the rubber coolant hoses from auto store, HPS radiator hoses and heater coolant hoses are made of race proven high-heat resistance material engineered for extremely high temperature service (Max. 350F) and prolonged exposure to under-hood and coolant heat. No more splicing hoses together creating potential leaks. The kit includes 100% stainless steel non-perforated embossed hose clamps for easy installation, which do not cut through the silicone hose. Remark: This hose kit requires IS300 OEM style radiator. Silicone hose water permeation rate is 10 to 15 times greater than standard EPDM rubber hose. Checking water level regularly is highly recommended when silicone coolant hoses are used in a daily driving vehicle. Warranty: 2 Years.