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When I did change new spark plugs for me the first time to this car about 1.5 -years ago to recommended four lead but otherwise 'conventional' material Bosch FGR6KQE 7413 plugs, the symptoms were very similar to yours. The engine was not happy with those, power was down and also the smell at the exhaust was very raw - not well burned gas.
The previous owned had installed NGK BKR6EQUP platinum tip four lead spark plugs. I then purchased same few day later and swapped the new NGK ones in and VOILA, the car run again very nice with bunch of power with no gas smell any more on the exhaust.
Could it be the you had a plug type issue there - were the plugs same you installed as what came out?
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Boxster 2.7 2001 Manual
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