The ICM is the module BELOW the coils that they attach to. It takes inputs from the crank and cam sensors in order to decide which coils and cylinders to fire.
Since you posted this in Performance, I assume you're thinking of upgrading to something better? For 92-96 all models, upgrading the coils to MSD 8224'* will benefit you, or 97+ SE, SSE, or SLE, but 97+ SSEi'* had an equally hot OEM coil.
Both ZZP and INTENSE state clearly that the stock OEM ignition system is fully capable of handling hot mods. This is true for the 97+GTP and SSEI'*.