On my 08 sti I have 55k on the clock. I ran the engine for sev yrs without s tune running an.injen intake. We were having issues during a current tune with the map. I and others believe the plug may be damaged from running lean. First pull 256whp but after that less than 200. When I pull the plugs how will I tell if they are damaged. I will be pitting.ngk one step colder plugs in. Thanks
Grant Sampson via tap a talk
Grant Sampson via tap a talk