We reached out to the team at CORSA and they have provided this additional information:
"CORSA Performance Exhaust had been producing some exhaust systems for APR for the past several years. In that time, we worked with APR to manufacture exhaust systems that featured our proprietary RSC® Technology to eliminate drone, as well as deliver to the acoustic, design and material specifications of APR. In every case where a system featured RSC® Technology, it was designed, utilizing one of the various patented and trade secret methods we have developed to reflect sound waves out of phase, thus eliminating specific drone causing frequencies. Each vehicle application is different and produces different frequencies that cause drone. CORSA Performance goes to great lengths to find those frequencies, and use one, or several, of our tools to cancel those frequencies through reflection. RSC® Technology is not a one-size fits all technology, but a specific design, engineered as a system for a specific vehicle.
In all cases where we produced exhaust systems for APR we utilized various methods, some seen in our several patents and others that are proprietary, to develop systems, not just mufflers, to eliminate the resonance and still craft a sound profile that was targeted for the car. We are committed first and foremost to eliminating the drone in vehicles and believe we have accomplished that on every APR exhaust system we produced featuring an RSC® Technology. I would invite you to explore our recently completely re-designed and updated website (
www.corsaperformance.com) to see our story (
http://www.corsaperformance.com/OurStory.aspx), and recently updated RSC® diagrams (
http://www.corsaperformance.com/Technology/exhaustRsc.aspx) showing more than one way we eliminate specific frequencies that cause drone. If you have additional questions about the technology, please contact us at
sales@corsaperformance.com or 1-800-486-0999.
Best Regards,
The CORSA Performance Team"