The yellows are the ones that are designed to work with a drop. Not saying the reds won't work, but if you are looking for what's best with a drop...go yellow over red.

What Koni says about the yellows (Sports):
"The KONI Sport product line is one of our specialties. KONI serves sporting drivers with a carefully designed range of sport shock absorbers and suspension kits with lowering springs. This line focuses on exceptional road-holding and handling properties, combined with an acceptable level of comfort.

Its characteristics include responsive steering, improved body control and limited body movements when braking and accelerating, all resulting in a direct feel and excellent wheel-road contact.

Many of the KONI Sport dampers are externally adjustable by means of a knob, so they need not be disassembled from the car. The fine-tuning of the damping forces to personal driving style and to different driving conditions is therefore not more than a matter of seconds. The best of fine-tuning technology straight from the world of Formula 1 racing."

The reds (special's):
"The red KONI line is meant for drivers who want to improve their car in general; better comfort and road-holding combined with a higher level of safety.

KONI Special shock absorbers are available for most performance cars. KONI select the most appropriate technology for each car from the wide range of shock absorber types. Each shock absorber is then customized for the car model. Hence, a KONI Special is always the best choice, for replacement as well as improvement."