The return to round headlights, a dramatically improved interior, and greatly improved handling are just a few of the reasons the 997 generation of the 911 is so widely loved. While those are certainly good reasons, we love it for the same reason we love most cars, performance! Whether it’s equipped with 3.8 liter S trim or the standard 3.6-liter engine, both variants of the 997 offer enthusiasts amazing potential for upgrades including everything from cosmetic upgrades to engine performance. Once we start talking about engine performance, we have to mention GIAC. If you’re driving a 997 or 997S without GIAC software installed, you’re leaving unused horsepower on the table, along with increased overall engine performance.