WR1 Owners Club

I have always been led to believe that a standard subaru will run NGk PFR6B plugs. and a modified subaru PFR7B due to the higher heat rating

Even thought the WR1 is a standard car, it has raised boost levels and a sports cat. so does that class it as modified?

what plugs do you guys run?

would personally run the 7's in anything with either raised boost or a de-cat........so yes the 7's would be "better"