So I NEED to replace my park plugs, and I looked everywhere local and all I could find are the ngk pfr6b-11 while on all the forums it says I need pfr6b-11b. every local shop I ask dont know what the b is for, and that none use that b at the end of the number?
are these plugs fine? I already purchased them because I want to put them in tomm. Is the b just a gimmick to get me to buy from online stores or what? thanks in advance -Russ