if going NA you wont see any gains going from 2.5 to 3. if going turbo then go 3" regardless of when you actually get the turbo set up. just get as big of a resonator as possible for the straight section.
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)