 A "Comfort And Sound" package is available on V6 powered G8s, which upgrades the seven-speaker audio system and manual HVAC controls to the 11-speaker audio and automatic climate control found in the GT model.The "Premium" package upgrades the Sedan's cloth seats to leather seating surfaces, driver and passenger heated seats, six-way power driver seat adjuster, 6-way power front-passenger seat adjuster, rear center armrest, leather-wrapped shift lever, and the GT's standard leather-wrapped steering wheel.Both the base G8 and the GT utilize the "FE2" suspension package.