turns out one spark plug is going bad and missing... (rear rotor housing, trailing, ngk R bur9eq) so i decided to just get some new plugs and was wondering what kinds of ngk plugs are u running on your fc? i was thinking of getting 2 bur7eq for leading and 2 bur8eq for trailing... and how about the platinum ones? what the difference between normal and platinum ones(spark, durability etc)? my fc is an 86 s4 n/a

 

if you have a stock or semi-stock s4 na, get the stock ones. 2 9's and 2 7's.

 

go with the platinums... BUR7EQP & 9

 

7s & 9s.

 

just replaced the plugs.... and noticed ALL 4 of the old ones were 9's!

 

that's not uncommon on turbo cars. kind of pointless on an n/a though.