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spark plugs, platinum vs copper

Engine

Model: 911, Year:1988, Mileage:134000, Type of use:Both Street & Track
The engine is a 3.4 with 10.5/1 compression, single plug. What spark plugs do you recommend? Do I go with the manufactures recommendation or do I need something different? Also, what about platinum vs cooper plugs? What is the difference and which should I use in my application.Thanks, Dale

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