Which one to get, underdrive, overdrive, alternator and crank, can someone please enlighten me?

 

Unless you have a monster stereo just the underdrive crank pulley will get you all you need.
if you do have that stereo them get the overdrive alt, but other wise no need.

 

you can get an underdrive for the crank and an overdrive for the alternator.

 

is the overdrive alt pully bigger or smaller than the stock one?

 

smaller. makes it spin faster and make more juice for your thump in the trunk pleasure

 

Also, the ASP pulley makes a full 13v charge at 900 RPM - if you have a raised idle you may not need the alternator pulley even if you have a decent sized stereo.

My idle is at 950 warm, 1050 cold and I haven't had any charging problems at all with my ASP pulley.

Bad30th