I finally decided to upgrade my sub to a 12" kicker L7 and will be pushing 750RMS at 1 ohm and am also about to get the UR underdrive crank pulley. I unfortunately have a crappy Delphi alternator and oem battery with 50k on it now. I was wondering 1) will the alternator hold up from the pulley and system? 2) will the battery hold up? 3) does it only put strain on battery and alternator only in idle? 4) is there any reason not to do this setup of sub an pulley?