The numbers we quote on product pages are crank horsepower ratings. Chassis dynos will show you your wheel horsepower rating. This varies all over the board by dyno time, configuration, pump fuel being used, air pressure in tires (traction), fan setup to act like a rolling road, and ambient temperature. Some dynos will give you a 20-25% drivetrain loss where others may be 10-15%. If you did not do a before and after within the same day or week, its impossible to know what your actual gains could be. Not all cars dyno the same.