Details:
CORSA Redefines Exhaust Technology
The exclusive, patented RSC™ muffler design delivers the throaty exhaust tones that define your performance BMW on the open road. But inside, you will experience the quiet ride, that until now, you've only dreamed about.
CORSA has now made it possible with RSC™ - Reflective Sound Cancellation™ technology - using aeronautical and space age noise-suppression technology. Sound waves are reflected within the muffler case, producing a cancellation wave effect - with no flow restriction and without electronic devices!
The RSC™ muffler design features a pipe running straight through the muffler that incorporates a full 360-degree air gap that allows sound pressure waves to escape. The waves are channeled and then returned to the gap 180 degrees out of phase, canceling specific sound frequencies. All that remains is the clean, crisp sound of performance.
CORSA Performance
Reflective Sound-Cancellation™ (RSC™) Muffler Technology
Automobile makers have been building mufflers for more than 100 years, and as the name muffler implies, the primary purpose of the muffler is to reduce noise emitted by the internal combustion engine. Muffler technology hasn't changed very much over the past 100 years. The exhaust is passed through a series of various-sized chambers in reactive-type mufflers, or straight through a perforated pipe wrapped with sound deadening material in an absorption-type muffler. Both types of mufflers have strengths and weaknesses. The reactive-type muffler is usually restrictive and prevents even the "good" engine sounds from coming through, but does a good job of reducing noise. On the other hand, most absorption-type mufflers are less restrictive, but allow too much engine noise to come through, especially at cruising speeds. And regardless of the packing material, absorption-type mufflers tend to get noisier with age.
More recently, automotive engineers have been experimenting with electronic noise suppression mufflers. A sound pressure wave 180 degrees out-of-phase is generated by an electronic device to cancel out a similar sound wave generated by the engine. It is an effective way of canceling noise without restricting flow. Unfortunately it is too costly and currently impractical for today's production vehicles. However, out-of-phase sound wave cancellation is the best technology to control engine noise.
CORSA's patented RSC™ technology reflects sound pressure waves within the muffler case to produce the same 180 degree out-of-phase wave cancellation effect, without flow restriction or electronic devices. It literally took the proverbial "rocket scientist" to come up with the design. An aeronautical engineer, with years of fluid flow, gas dynamics, thermodynamics, and acoustics experience on NASA and numerous other government projects, was employed to adapt some of this space-age noise-suppression technology to automotive mufflers. The result is the CORSA * Reflective Sound-Cancellation™ Technology.
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