my alternator died last week so i figured i'd get something a little beefier and stumbled across one on ebay that was stated to put out 140 amps for 135$ er so shipped. the first thing i thought was that it was one of those rip offs way too good to be true things. but i figured worst thing that could happen is that i get a refund. when it arrived it had a pulley that was almost half the size of the stock pulley so i switched them out, installed it, went to o'riely's and they said it was putting out 125 amps. in my eyes that's a pretty good investment for being cheaper than oem. so if you're rockin a b20a3 and you need some more power check out user more_amps on ebay.