Originally posted by 2000GreenTour:
"less kr"? 
I heard it decreases HP, that's all.
I'm guessing kr is knock retard. I dunno. Thats the only thing I can think of. When there is less octane the engine will ping, I think the knock sensor senses that and retards the timing which takes away horsepower and your running a little fatter. Sounds good to me 
2004 Evolution VIII cams-exhaust-tune
315whp 12.7@109
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