air intake... no its not really doing enough. the SVT exhaust yet. You also need to look at a tune to remove EGR (some have said there are "other ways") or you will have a cell. The SVT exhaust will lean out the motor to what some say is "unsafe". Focus power will provide updates for when new parts are added on. Note though the Xcal 2 program is tied to the vin number via the ECU. you will need to get one for each vehicle if you want a tune on each.
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)