Next to the coveted GT3 and GT3 RS models, the Carrera GTS is perhaps the most desirable 911 of its era. In addition to featuring the wide-body from the Turbo model (but without the added weight and complexity of an AWD system) the 3.8L Flat-Six in the GTS has the upgraded 408 HP “power kit” from the regular Carrera S (a $16,900 option) as standard equipment.