Hey everyone I got a quick question. I was reading that the b18c type-R requires premium fuel only, to prevent a knock. The article also said its because it has a higher compression 10.6:1. Would the same go for a b18c sir-g or Jdm Gsr? Because they also have a 10.6 :1 compression ratio and I've been pumping just regular fuel lol someone shed some light on this! Thanks!