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Can't help you with the S-AFC II - need to get a hold of your ECM pinouts. If you can find one - get an ECM wiring harness (sort of like an extension harness). That way - any modifications you need to do, will only happen to this harness and not to the OEM wiring - makes it much easier to go back to OEM, if something goes wrong or you run a different EMS system.
As far as the headers - install the headers first. That way, the exhaust can be fabbed up to match the header. If you went exhaust first - then you'll potentially be making two trips to the exhaust shop.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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