Porsche M97.21 engine
The 3.4-liter Porsche M97.21 boxer engine was produced by the company from 2005-2009 and installed in advanced versions of the Cayman S coupe or Boxster S convertible with the 987 body. There was also a slightly more powerful version of this engine with the index M97.22. The M97 lineup also includes M97.20.