Want to order some new spark plugs this weekend, and as I am running mods I want a decent plug again. The NGK Iridium (BKR6EIX) I used for the last 15k have been flawless, and I want to buy some more. Pic below shows Bosch plug on the right, NGK on the left (Bosch has done 4k, the NGK 15k)
I have had quite a few conversations with people who have recommended running cooler plugs to offset the modifications I have, but most suppliers I call up don't know which model of the NGK plug is a cooler one. I spoke to someone from Denmark who said NGK's BKR7EIX is the cooler version of BKR6EIX. Does anyone know if this is true?
Conversely does anyone on here have any experience / thoughts on fitting cooler plugs?
Many thanks in advance.