Jaguar Low-Temp Thermostat - Jaguar Performance Parts. Get a little more performance out of your Jaguar XJR, XKR, S-Type R Supercharged 4.0/4.2L with this lower temperature thermostat. Eurotoys Ltd. was 1st to test and offer this performance lower temperature Thermostat for your Jaguar. This High-Flow Thermostat has a 13.2 degree lower opening temp than your factory Jaguar Thermostat. Having consistent control of engine temperature allows an engine to operate at its peak horsepower - no matter what the driving conditions. The factory Jaguar thermostat simply opens to late, which is bad for performance.

This Eurotoys Low Temp Thermostat improves performance in two ways: first by inducing less heat into the intake air and second by reducing the engine's tendency to detonate.

*Comes with Jaguar Factory Gasket.
*This is not a "Off the Shelf" Thermostat, this T-Stat has been modified to fit the OEM Jaguar Thermostat housing!
**Not for US Model Year 2007 & newer 4.2L.