metal

Hello, Since about a week ago, I have noticed a strange chirping/metal grinding sound coming from the turbo side of the engine bay whenever I reach about 3500RPM or just by quickly pressing the throttle, no matter what gear I'm in. The car is a 1995 jdm wrx, 84000km and the only mods are...

Trying to find out what one would be better, either the carbon fiber cooling plate or the metal cooling plate? Not so much concering weight but more toward the heat factor.