I am almost done installing the greddy turbo on my S. and i'm sitting here wondering what spark plugs to use. i heard that i have to use one step colder spark plugs but i don't know the part number. Does anyone know which spark plugs are step colder and it part number PLEASE...

 

NGK number 7173 (R5672A-8) is a heat range 8 non-resistor, copper plug. NGK number 5068 (IFR8H-11) is a heat range 8 iridium plug. Either will work well for you.

 

7173's cheap and work great. Should be changed every 5k or so though.