Basically, VTEC is more powerful and gives an extra boost during high RPMS while a non vtec doesnt. VTEC usually has more horsepower then a non vtec conterpart.VTEC is an electronic and mechanical system in some Honda engines that allows the engine to effectively have multiple camshafts. As the engine moves into different rpm ranges, the engine's computer can activate alternate lobes on the camshaft and change the cam's timing. In this way, the engine gets the best features of low-speed and high-speed camshafts in the same engine.