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Remember that stopping distance is mostly a factor of weight and tire grip, not brake components. Base Boxster brakes are some of the best in the business with a stopping distance similar to a Ferrari Marinello. If your car does not stop on a dime, there is something terribly wrong with your brakes (contaminated brake fluid, bad master cylinder, bad wheel caliper. bad brake booster, etc.)

Get your brakes checked by a qualified tech. After having your brake system thoroughly serviced, switching to a more aggressive bite will give you quicker braking response with less pedal effort. Pagid black, Performance friction 03, Raybestos ST-43 are a few good choices with a lot of bite. These pads will easily overpower a set of stock street tires on the front. Maybe just better tires is your answer.