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Discussion Starter · #3 ·
Secondary Air Injection, it pumps a small amount of air into exhaust to help burn unburned fuel. With a free flowing exhaust, some S3s have been known to backfire alot due to this. If ya need more than that, theres been alot about it buried somewhere on this site.
 

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As far as I know it is only Australian and New Zealand bikes that do not have the SAI or catalysers
 
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