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I use NGK Iridium spark plugs they run around i belive 8-9$ each they work well, Id reccomened changing your spark plug wires for better enegine respone, if its been over 5 years or lack of combustion, and less respone. Use aftermarket brands, rated alittle hotter to burn the fuel more efficently, Ngk is still another good brand or taylor never used them though.

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Q: What is the best spark plugs for 04 Mazda 6?
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