Impreza RS Coupe AWD F4-2.5L DOHC (1998)
Spark Plug: Specifications
Item
Designation
Spark Plug
Type and manufacturer PFR5B-11 ....... NGK, RC10PYP4A .... Champion
Thread size mm
14, P = 1.25
Spark gap mm (in)
1.0 - 1.1 (0.039 - 0.043)