NGK (1675) PFR7S8EG are the current OE plug, but they are platinum center core_have a 1mm center core_and have a 0.031"(0.8mm) gap. They work fine.
NGK (2667) BKR7EIX are highly used; they are Iridium center core and platinum coated ground electrodes_have a 0.6mm center core_and also have a 0.031" (0.8mm) gap. They may last longer than the platinum center electrodes. But if you do not plan on running the plugs more than 50k miles...it shouldn't matter which of these two you use.
NGK (4853) PFR7B are a good choice for high boost, but this is only due to them having a factory reduced gap of 0.7mm. They too are a 1mm platinum center core and come with a 0.027" (0.7mm) gap.
R8 coils; are a 5.31 Mohm resistance coil...not meant for a long duration during ignition. OE are 3.3 Mohm (refers to secondary winding resistance) and are meant for longer duration ignition and quick recovery of voltage. The longer duration is meant to provide better fuel burning during combustion.
