roy, you can use a 130 amp out of 94+ models. if you want more amps, i wouldn't recommend getting an underdrive pulley set. i have upgraded to this alternator, and i also have and underdrive crank pulley, and i still see the needle drop at night when my lights and other items are on and i am stopped. i also have a bxt65850 battery, which puts out 900cca, and 1000 ca. guess the alt. isn't big enough for all my electrical equipment!!! you can get a used 130 smpalt for about $50.
2003 Ford Expedition: 5.4L, harley supercharger, 2.93 upper pulley, 4lb lower pulley, c&l plenum, jlp cai, LFP SBTB, FTSP, Magnaflow 3" catback, Eclipse AVN-5510, white face gauges, cobalt c2 boost gauge, ddm hid's, 379 rwhp, 465 rwtq sold 11/3/12
2009 Ford Flex Limited AWD