The SVT conversion is the single best "bolt on" performance mod that can be made on the Zetec. The HP gain per $ spent will be less on any other bolt on. the SVT header has shown solid gains in the 11HP mark at the wheels. With a Tune, and Dyno tuning Adjustable Cam Gears are some of the best mods that can be done on the Zetec. The only other way to get a higher HP increase per $ spent will be going forced induction.
You can also waken up your car by new springs and suspension changes that are relatively cheap.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)