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From the Boxster service manual as of MY 2005 - which usually means MY 2003 for engines:
Spark plugs Using new spark plugs Tightening torque 30 (22 ftlb.) Nm
Spark plugs Re-using old spark plugs Tightening torque 25 (19 ftlb.) Nm
The recommendation is to back off on used plugs.
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2003 S manual
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