The HID will just replace the low beam not the high beam. The higher the K the less lumens they put out. 3K=yellow 4k=white 5k=very white 6k=blueish 8k=deep blue 10+k=purple. On my evo they are 4.3k from the factory, I'm upgradeing the bulbs to a 8k because i like the color of the light better, it looks way different then 4.3k.