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Have a 2021 Mustang EB HPP convertible, slipped in a K & N air filter, and a few days later, check engine light came on but didn't flash. Dealer says it indicates something with emission system, but they want to hold the car two days to diagnose it, sigh. Checked airbox clamps, clamps for hose to turbo, fuel nozzle door, all OK. If I have to wait that long, might as well buy the Air-Raid more streamlined hose from airbox to turbo and see if that cures it. Ideas, thoughts, please?
 
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