i was considering removing my air pump, electric fan replacement, and underdriving components of my engine (alternator, ac, etc.) with pulleys i found on rx7.com. Are they worth it? Should i put these pulleys on or will they cause stress to my electrical system because of underdriving the alternator and adding the electric fan? thanks

 

I would not do the pulleys except for the water pump. A bigger pulley on the wp helps fight cavitation at high rpms. I have the fan mod and it works great.