You don't have to be an AOPA member to read this:
http://www.aopa.org/aircraft/articles/2010/100526exhaust.html? WT.mc_id=100528epilot&WT.mc_sect=gan
You don't have to be an AOPA member to read this:
http://www.aopa.org/aircraft/articles/2010/100526exhaust.html? WT.mc_id=100528epilot&WT.mc_sect=gan