I just bought a 883 hugger for my first harley, I went change my plugs but noticed two things, the previous owner put a cooler plug in and also that the plugs were whiteish, the previous owner installed 2" drag pipes on it and clamied he had the pipes rejetted?

I have a S&S air cleaner setup id like to throw on but I don't want it to run any leaner then it is anyway,

I want to throw the right plugs in and jet it to that. But not even sure were to start with what jets, Thanks XD