The Thermostat enables the engine to reach the correct operating temp' quickly- in the morning on ignition,you will notice the rev is high. but lowers once the proper temp is reached.
If i were you,i would ensure cleaned,[tends to rust] and leave it intact.
I am the master and the captain of my fate,roll the dice,let the chips fall where they may!
"For i am the master and the captain of my fate"