Denso Iridium for my E46 325I

[MyBimmer]

I would like to change the plug to Denso Iridium. Please advise the correct one betw IK20 and IK22. Some say IK22 because the gap is 0.032 and match BMW spec, but Denso official website recommend IK20 (gap 0.04). My understanding is the IK20 and IK22 have different heat range as well. TQ

 

[trustgtr]

i'm interested to know as well, checked with NGK site it states BKR6EIX -11 with 0.5 gap, thought mostly come with 1.1 gap..and IK20 on Denso's but with no gap stated.