With the first generation of Revo Technik programming, changing between performance and stock modes, enabling our supplemental security system, or opting for a more aggressive 93 or 100 octane program, is accomplished using our optional SPS-1 or SPS-2 switches. However, if you're looking for the ultimate in tunability and control, variable boost, timing and now fuel adjustment are available with our optional 'SPS Plus'. Another first from Revo Technik, the new 'SPS Plus' consists of a diagnostic port interface, USB cable and new PC based software. Boost, timing and fuel adjustments will be made via our downloadable software utility. The changes are then uploaded directly to the ECU. The 'SPS Plus' will feature 3 "user based" modes that will permit one to save their modified performance settings and access them quickly and easily using just the interface. These saved files can be changed at any time and re-saved as your mechanical upgrades or environmental conditions permit. Combined with the ability to revert to stock programming, and our unique anti-theft mode, the 'SPS Plus' is unmatched in its ability to provide the highest levels of control and flexibility over the programming.