Originally posted by Redcon96V4:
I've heard the UDP doesn't actually help that much and can wear out your engine(may not concern you since it probably takes thousands and thousands of miles).
under drive pulley doesn't wearout the Zetec the problems with the underdrive pulleys is only on the duratec... with mine I got 2hp and 8TQ with the Esslinger pulley... I think it was well worth the about $70 I paid for it.
