does not need to change special valve springs. It is a so-called the bolt-on camshaft. Moreover, The Super Street Camshaft is compatible with the factory ECU. Although the vehicle easily ups the torque by exchanging the camshaft only, it will be able to get more power by adding pre-programmed M7 piggy-back unit (sold separately). This new camshaft is the best for the street use because it has the quick response and the easiness to drive.