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For change frequency elvis is quiet right in above explanation. By not changing spark plug in time, you will start missing the engine performance especially on low revs initially and then across the full power band. You will feel rough idling and sluggish response if plugs are not change in time. Better go here and see what you have: http://www.ngksparkplugs.com/part_finder/car_truck_suv/default.asp?mode=nml Changing plug in any Porsche is not too difficult and it's not too easy, it's a reasonably moderate job and experience mechanic can change all plugs in less than an hour max. Which boxster you got: 2.7 or 3.2...? and how come 2005 model hitting 100k now, rarely driven or you just bought it now?