Mishimoto LS Heater Core Bypass Hose BlueMishimoto LS Heater Core Bypass Hose Blue Mishimoto LS Heater Core Bypass Hose Blue If youa**re doing an LS swap, chances are you wona**t be running a heater core in the platform youa**re swapping. Whether youa**re doing an LS swap or building your LS powered racecar, the Mishimoto Silicone GM LS V8 Heater Core Bypass Hose is the easiest and cleanest solution for bypassing your heater core. Our bypass hose is constructed from heat and pressure