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Old 02-08-2013, 11:29 AM   #13
Andrews-bad-SE
Focus Enthusiast
 
Join Date: Jun 2012
Fan#: 100389
Location: O'fallon, MO
What I Drive: 2003 Arizona Beige SE 4dr Zetec/ATX

Posts: 182
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Other than a shorty (ramhorn) style header and a highflow or gutted cat with an o2 cheater, I really don't know. A 4-2-1 or 4 to 1 header as well as a cold air intake work best with a proper tune. Even without the tune though, every little bit helps.
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