If you get BOSCH plugs then they should be pre-gapped however they are manufactured-in china so I'd check them anyway 
Not sure about a street car engine but the sparkplug gaps in performance racing motor always grow as they wear so we always gap them 5% smaller than recommended.
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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