I've heard too many horror stories with Volvo I5 engined cars to recommend anything other than OE spark plugs. Just my opinion, but I think you should stick with the Volvo double platinums.
As for removal/installation, you do know that you need a special deep socket with a rubberirized lining to protect the new spark plugs right?
And as for torque, you need a mere 18 ft.lbs. Don't over do this as the engine is aluminum, while the spark plugs are a stronger steel based alloy. So you can damage the threads rather easily either through cross threading or over torquing.
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