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"Red KONI Special dampers are more biased towards comfort, yellow KONI Sportdampers are so towards handling."
Most Yellow Koni's are externally adjustable, that is you can adjust them by turing the pin that sticks out fo the top of the shock. Most of the red Koni's you have to remove the bottom of the shock and compress it then turn it to reset the adjustment.
The yellow Koni's for the C4 are comfortable for the street, but aren't as plush as the red ones....