The SSEi not only packs supercharged punch, but ups the equipment ante with dual exhaust, high-performance 17-inch wheels and tires, GM's StabiliTrak suspension system, and a Bose eight-speaker premium audio unit. You also get other high-tech goodies, such as EyeCue head-up display, variable-effort steering, and 12-way power leather front buckets with memory. (Link to full review)