Maas Neotek
Maas Neotek is a mysterious, foreboding city populated by the technologically enhanced hepcats. While daunting to reach, located in the Crater's Rim--which happens to be a considerable distance from the relative safety of Freedom City--the equipment there is acknowledged to be far better than what is available in Freedom City, but even after the trek up into the crater, there are still the hepcats to be dealt with....
Regardless, Maas has several useful mutations, one of which is the oft-used High Density, which are worth the effort to make one's way up and sneak past the hostile inhabitants. At best, the average hepcat will simply make jokes about you; at worst, a hepcat such as Jack (the one with the poisoned dagger) will take a stab at you, probably killing you after one or two skull-crushing hits. Hepcats are not to be taken lightly, unless you have a highly skilled escort.