i use ngk bkr7eix (irridium) in both my cars, gte turbo, c20let 308bhp and 2003 gsi turbo, 265 bhp, i spoke to ngk technical and they advised me to use the part no listed
As per Adam & vxlaney, I've been happy with NGK bkr7 plugs on LETs in the 300-400bhp range. Bosch F5DPOR have been fine too.
One step colder for my GT3076R engine - NGK bcpr8evx-11 gapped to 0.6mm
If you are looking to go a step colder or hotter, note the heat rating on NGK & Bosch plugs run in opposite directions.
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