Yeah, the heater core thermostat opens at a much lower temp than the conventional thermostat, it's for emissions, and in theory it should also shorten the time it takes to get heat in cabin. Though IMO these motors still warm up extremely slow... Unless the motor has cooling system issues (scale buildup, clogged passages, leaky head gasket/inefficient water pump), using a hotter thermostat will never affect total latent cooling. Personally i'd go OEM, dealer prices are surprisingly good for most stuff, you will never go wrong with OEM on any imports. Plus you can use the new longer life blue coolant. I think it's HOAT though, so make sure you do a thorough flush with distilled water, HOAT and OAT mixing forms a nasty combination.