Hawk ER-1 Race Front Brake Pads - 09-11 Porsche 911 Carrera - HB667D.622 Boostnatics The stock thermostat must be

The stock thermostat must be removed and the Mishimoto thermostat installed in its place

This does add some size to the harness and reduces flexibility slightly

4224220 is a 4-pad spring-centered race disc made with high quality

If you plan to track your car or get the full life of your tires these are a must have

Hawk ER-1 Race Front Brake Pads - 09-11 Porsche 911 Carrera - HB667D.622 Boostnatics The stock thermostat must beER 1 has been developed by Hawk Performance for the endurance racing market with a simple goal; offer a higher coefficient of friction than competing endurance pads while maintaining matched or improved lifespan. Years of testing across Americas most prestigious races has resulted in a well rounded compound that offers ideal modulation and pedal communication, with ground breaking friction stability across a thermal range as high as 1,600F. This