Saan ba makakabili? Yung kasing mga auto supply na pinagtatanungan ko di alam difference between non-resistorized and resistorized plugs, di rin alam ang cold and hot plugs.
Look for every brand that denotes each SP codes. This somehow varies from one another.
Ex:
For NGK: BKR6E ...'R' = Resistorised... so find/look w/o an 'R' simply as: BK6E, BK5E (hotter) or BK7E (colder). For Bosch, Denso & others, just look for the cross-reference.