I understand cooling may be diminished and depending on the pulley setup you choose the A/C system as well.
But has anyone running these pulleys noticed any power steering lag during quick corrections? I would hate to install a set and then have the power steering not react 100% while quickly correcting unanticipated oversteer, etc.
Also, I haven't seen the charging system addressed. All of these pulleys must underdrive the alternator as well? I know the M3 charge system is already very weak.. just spent $500 on a new battery.