hi
i think about change sparks in my car because last week i do inspection and sparks looks in bad condition, i have now NGK PFR6B, but i read on forum in USA and in my country for my car the best is NGK PFR7B , so now i dont know witch plugs is best choice , where is different btwin, i dont know somebody fit wrong sparks or this is right , please helpme if someone know something about it.

Thanks

 

Standard Car 6B

350+ 7B

 

cool, thanks

 

Make sure they are gapped properly too!