You guys know an UDP for the crank on a Duratec is a no no right? It's why you never hear of ppl running them. The purpose of a DMD is to reduce harmonics. An underdrive will introduce more. Who knows maybe you won't have problems with one but I wouldn't chance it for the minimal gains.

-'96 SE MTX 3L -'98 SVT 1,173 of 6,535 -'05 Mazda 6s, loaded, g/f's ride -Need a 96-00 manual on CD? PM or email me