i have a b18c1 bottom end with jdm ITR pistons, a pr3-4 head and need to change spark plugs, does it matter if their gapped for gsr or type-r, is so which is better and what plugs do you recomend.o yea, it's 11:1 compression also.

 

Get the ones gapped for the ITR. The B18C1 and ITR share the same block. The ITR crank is slightly heavier. So, you basically have an ITR engine.