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Old 06-03-2010, 12:19 PM   #2
Peregrine
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Join Date: Apr 2004
Fan#: 6009
Location: Wadsworth, IL
What I Drive: '03 CD Silver SVT, '11 Mazda CX-9

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I've never had to flash the ECU back to stock here in Illinois. As long as that CEL doesn't come on when you have the performance tune in there, you should be able to pass emissions.

BTW.... All OBD-II and newer cars here in Illinois just get checked through the OBD port.
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