APR B8 S4 3.0TFSI RSC Exhaust
APR is pleased to present our first RSC™ Exhaust System for the Audi marque in the new 3.0T B8 S4 Model Years 2010+.
RSC™ or Reflective Sound Cancellation allows for maximum exhaust gas flow while completely eliminating unwanted in cabin sound resonance known as "drone". Reflective Cancellation bounces the undesirable sound waves into each other to attenuate the wave and eliminate the low frequency tones that create drone. Each RSC™ muffler is tuned to eliminate specific, undesirable sound frequencies allowing only the engine's true and desirable exhaust note to be heard and improving performance.
Unique Exhaust Tip Options
APR's RSC™ Performance Exhaust for the B8 S4 introduces modular tip design that allows the end user to specify an initial tip color of either Stainless Steel or Diamond Black and other tips can be ordered separately and changed at the owner's pleasure.
Weighted SPL and Competitive Comparison Analysis
The following data was measured from an Audi B8 S4 3.0T FSI at a 70 MPH constant speed cruise. Sound measurements are made inside the vehicle and recorded as sound pressure level (SPL) in decibels. Comparisons show the resulting sound levels tested with no mufflers, stock mufflers, with a competitor's exhaust system, and the new RSC Performance Exhaust system.
Many of the competing exhaust systems do not significantly reduce the low frequency tones that occur around 50 to 200 Hz. It's these frequency tones that are responsible for "drone". RSC acoustic prediction methods and design techniques reduce these tones without compromising the sporty sound we all enjoy from high performance automobiles.
The light gray bars show data taken from the S4 with a competitor's exhaust system installed. The red bars compare results from the RSC™ Performance Exhaust system. The dominant low frequency tone responsible for drone occurs at 131 Hz and has been significantly reduced with the RSC™ Performance Exhaust system by about 12 dB compared to the competitor's exhaust system.
The following graph illustrates the narrowband acoustic spectra for the competitor's exhaust system and the RSC™ Performance Exhaust system. Both the dominant tones and the broadband sound levels are quieter for the RSC™ system over most of the frequency range, especially around 131 Hz where drone notes dominate.
RSC™ technology provides sound levels comparable or even quieter than OEM exhaust systems at cruising speed. RSC's™ design minimizes back pressure and provides gains greater than other performance exhaust systems. The example shown for the B8 S4 3.0T FSI demonstrates the ability to tailor the sound spectra to eliminate drone while maintaining a sporty sound, especially under full throttle.