SI-Drive (Subaru Intelligent Drive) system allows the driver to maximize engine performance, control and efficiency by choosing from among three selectable modes – "Intelligent", "Sport" and "Sport Sharp" – using a rotary dial on the center console.

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The SI-Drive controls the electronic throttle system’s response and fuel and ignition curves to modify engine torque characteristics, changing the performance character of the car in each mode. With "Intelligent" mode selected, the system reduces engine torque and maximum power and switches to a more relaxed throttle response curve. Intelligent mode is an ideal choice for smoother response while commuting in traffic, for example, where it can also help boost fuel efficiency by up to 10 percent. In addition, "Intelligent" mode’s more relaxed responses and lower torque output make it an ideal complement to the low-traction surface driving safety provided by the Subaru Symmetrical All-Wheel Drive System (AWD).

In "Sport" mode, the performance of the 2.5 GT spec.B (and other 2007 turbo Subaru Legacy and Subaru Outback models) is similar to the 2006 model, with quick throttle responses and powerful, linear acceleration. The linear acceleration characteristic of this versatile mode makes it ideal for driving on freeways and suburban streets or for climbing mountain roads.

In "Sport Sharp" mode, SI-Drive modifies the engine’s electronic throttle mapping to deliver lightning quick throttle response and more power sooner. Delivering maximum driving enjoyment, this mode is ideal for tackling twisty roads and for merging or overtaking other vehicles on the highway with confidence.

On 2007 Subaru Legacy and Subaru Outback models equipped with the 5-speed automatic transmission (not available on Subaru Legacy 2.5 GT spec.B), SI-Drive also changes the transmission’s shift patterns. It will hold each gear longer through the rpm range and downshift more quickly under hard acceleration, depending on the mode selected.

The SI-Drive system includes instrument panel displays that allow the driver to monitor performance. The multi-information display located in the tachometer face – in addition to providing trip computer functions – denotes the selected SI-Drive mode and provides an active torque curve display.

When "Intelligent" mode is selected in vehicles with a manual transmission, a shift-up indicator blinks to signal the optimal shift point for maximum fuel efficiency.