So in the past I have always run NGK TR6 plugs i cant remembering the gap its been a long time so hopefully someone can help wanted to change them out before i get the car retuned.. Looking to bump it up to 150 shot running 103 octane fuel... if anyone has other plug suggestions also willling to change.. Havent been driving the car past 6 years so havent kept up with the latest and greatest
thanks
thanks