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2003 chevy trailblazer_lt_ext
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Discussion Starter #1
I'm seeing a lot of info on here saying that performance filters from K&M, True Flow, or AMSOIL can significantly improve fuel economy. But looking into this, I ran across this: ISO 5011 Duramax Air Filter Test Report, which claims that the stock filter does a much better job than any of these "performance" filters. Does anyone have any evidence against this? Is this all just snake oil?
 
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