CORSA's Patented Reflective Sound Cancellation(R) (RSC) Technology allows acoustic engineers to create a drone free exhaust sound, styled specifically to fit the personality of your vehicle. Each system is designed to increase vehicle performance, deliver an AGGRESSIVE SOUND under acceleration and a DRONE - FREE EXPERIENCE during cruise. CORSA's innovative Valved Exhaust System allows drivers to customize their driving experience using Dual - Mode NPP. Performance gains are not affected by sound choice.