The trick is output at idle - 2000 rpm. Most don't measure up. Above 2k sure but that's not where you need it. The quality aftermarket like mechman will but a lot of stock rewinds won't. The sequoia unit supposed to do over 100 amp at 800rpm.
I just got an aftermarket 160 amp alterntor off of that auction site everyone uses that starts with an e.
I had it benched and it was definitely producing what it was rated for and I ran a big 1/0 gauge wire (overkill I know) from the Alt to the battery to facilitate current flow. And it was less than $150 shipped to my door.
I think Biggu is selling a MechMan HO Alternator in the classifieds here and mechman always had a solid reputation on caraudio.com an realmofexcursion forums. So that's an option as well if you don't want to mod an alternator to fit.
hes right i did the same, but i got a 250 AMP alternator and i works great. just buy it of an online auction and it should suffice!
ranging from 140$ - 325$