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More questions than answers at this point. What type of racing are you doing? Auto-X, time trials, Boxster spec, big track, tight track, short track oval... Are you a Pro or a Joe? One coilover definitely does not fit all.

Figure out what class you will be running and build your suspension to the max in your class. Some classes penalize you with heavy points for certain shock types while other shocks are free. Once you choose a suspension to meet class rules, carefully tune it to your tracks and driving style.