you have to be a damn good driver to hit 15's with a non SVT Duratec, its highly unlikely unless you have perfect conditions, hook up just right and you're at 0 elevation.
and no, i'm not saying Duratecs cant be built up. There are 2.5's that are running in the 13's with turbo's and 3.0's running 13's N/A. So yea, i know duratecs CAN be built up. But so can the Zetecs! there are Zetec Focus's out there running 14's all day long. With enough work, an N/A Zetec can be as fast as a mildly modded Duratec.
Also, the cams would just be the beginning of the building up of the engine. There are still plenty of mods to be done, such as different rods, pistons, lightweight flywheel, intake manifold, header, head, etc. So what if ther are SOME family sedans that are faster, its not about them, its about making my car faster. So far i've improved the car alot, from running a 0-60 time of 13 seconds, to running in just over 9 seconds. Still, yea i know its not fast, but its FUN. Thats why i'm doing it.
Oh, and BTW, what do you drive?