This lower temperature thermostat allows the water jacket around the engine block to operate at reduced temperatures which in turn keeps all the engine cylinders cooler. It is also believed that lower engine operating temperatures can reduce the risk of the engine cylinder bores becoming scored. 

This is a popular modification amongst Porsche enthusiasts. It is suitable for race, track-day and road cars. 


It is suitable for all engine models of :-

986 Boxster 2.5L, 2.7L & 3.2L (Boxster S) built 1997-2004

996 3.4L (Carrera) & 3.6L (Carrera, Carrera S) built 1998-2005

987 Boxster 2.7L, 3.2L (Boxster S) & 3.4L (Boxster S) built 2005-2008
987 Cayman 2.7L & 3.4L (Cayman S) built 2006-2008

997 3.6L (Carrera) & 3.8L (Carrera S) built 2005-2008

Manufactured by Wahler
Manufacturer part number 4249.71D
Porsche part number 996 106 013 57, 996 106 125 52

Alternative Porsche part numbers 99610601357, 996.106.013.57, 996-106-013-57, 996_106_013_57, 99610612552, 996.106.125.52, 996-106-125-52, 996_106_125_52, 
Alternative manufacturer part numbers 424971D, 4249 71D, 4249-71D, 4249_71D,