We have updated reliability stats for the Boxster and Cayman that include owner experiences through December 31, 2010.
Repair frequencies, in terms of repair trips per 100 cars per year:
2008: 39, better than average
2007: 59, about average
2006: 49, better than average
2005: 54, better than average
2004: 88, about average, small sample size
2003: 58, better than average
2002: 124, about average
2001: 104, about average
2000: 90, better than average
1999: 106, about average, small sample size
Important note: these cars are only driven an average of 5,500 miles a year, about half as much as the average car. No adjustment has been made for this.
Six IMS failures were reported for the 2010 calendar year, most of them for 2004-2005 model year cars (with the 2005 being a 987 rather than a 986). Some of these failures might have occurred before the car was enrolled, in which case they would not be included in the above stats. So this count might err on the high side. The total sample size for 1999-2005 is 220 cars. No IMS failures have been reported for cars 2006 and newer.
Thank you, once again, to everyone who has been helping. We'll have further updates, possibly including additional model years depending on the number of participants, in May and August.
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Porsche Boxster reliability ratings and comparisons