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Typo error on my previous request, anyone would like to suggest what kind of performance spark plug I should replace for my Nissan Versa 2009 1.8s
 

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These are the 2 popular plugs from rockauto. It my experience Japan made engines like Japan made plugs like NGK. Autolite is Ford, but they got a rebate to save you some $$ while its still Iridium made plug. I do not believe its possible to get much performance benefit from plug design for such a small displacement engine. Sure Ive see single digit % gain, but with 100 hp max thats like 1 hp, but the margin of error is greater. If you got 8, 10, 12 cylinders and producing close to 1,000hp yeah, a single digit % increase will show up.

AUTOLITE XP5684 Iridium (Rebate/Promotion Available!)



or

DENSO 4711 Iridium Long Life; Iridium TT
 
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