Has anyone changed out the thermostate and/or the radiator cap on your car? Has anyone that has noticed any change in performance, good/bad or otherwise?

 

I've got a koyo radiator, nismo thermostat and 300ZX TT radiator cap. Stock cap is .9 psi, nismo is 1.3 and 300zx is 1.2 and only $10.
My temp is a little lower overall and never fluctuates. Didn't fluctuate before the new radiator either, but I broke the old one.