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If you dont have SAI compatibility then your car will throw a CEL and your car will bog down into limp mode. If you want to get any kind of aftermarket intake/header it MUST be compatible with your SAI. I would suggest K&N, but you can shop around and find whats right for you.
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2007 Cobalt SS/NA 
Performance:K&N short ram intake, Purple Hornies glasspack, Jet Stage 2
Visual: color match bowties, shorty antenna, blue footwell led's, partial debadge
Coming Soon:Vibrant 4-2-1 Header/DP
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