MTM software together with 2 ITG performance air filters will bring the horsepower to 510 and 515 lb/ft of torque. Designed with U.S. emissions and fuel quality in mind. Software will also work with all dealer diagnostic tools. All software comes with a 30-day satisfaction gaurantee. Software is extremely smooth, will not effect idle, hot start, cold start and will actually improve MPG during normal driving conditions. Speed limiter is also removed.