First off only buy from Ford.
Secondly buy the alt underdrive pulley from metco. They really spin too fast from the factory. I haven't had any issues even with a 2# lower since installing mine last time I changed the alt.
"I'm not driving too fast...just flying too low"
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
90 7up vert - new project-07 DSG Focus -DD