Originally posted by LoCoZ:
Originally posted by SleeperZ:
Originally posted by ChattavegasSE:
Yeah the 2.5L and 3.0L Duratec v6's have secondaries that open at 3750rpms. 'Zetec' and 'Duratec' are just the names of the engines. There is alos a 2.3L Duratec 4 cylinder.
The SVT Focus also has dual stage intake runners.
With a little modifying and some electronic control they can be made to fit any Zetec.
I've been thinking about that......there has to be some kind of solienoid/switch controlling the intake......where is that solienoid located........ 
I dunno. I know where you could find out though *cough*focaljet*cough* 
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