I'm looking at installing the Corksport lightweight crank pulley (and the SURE Torque R2 engine mount) at my next oil change (12k), but I had a few concerns. Is the engine on our cars internally balanced? Also, I've seen reports of turbo Mitsubishis with lightweight pulleys experiencing premature wear on the crank bearings. However, this is a significantly lower-power application. Should I be concerned?