APR has successfully licensed the new exhaust technology, RSC™, Reflective Sound Cancellation, to further enhance APR's line of performance exhaust systems for VAG vehicles.

Reflective Sound Cancellation allows for maximum exhaust gas flow while completely eliminating in cabin sound resonance (drone). RSC™ incorporates innovative technologies developed in conjunction with NASA. With limited use of packing materials and no baffles, RSC™ allows for a completely straight and free flowing exhaust path through the RSC™ exhaust boxes. 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 desirable exhaust notes to be heard and improving performance.

The first APR application to feature RSC™ technology is the New MKV GTI 2.0T FSI RSC™ Performance Exhaust System. Benefits of the new technology allow APR's RSC™ Exhaust Systems to meet the European Union and other countries' noise requirements of 90db or less in new car exhaust sound and even increase performance over traditional performance exhaust systems.

APR debuted RSC™ Exhaust Technology at Waterfest 14 with APR's MKV GTI 2.0T FSI RSC™ Performance Exhaust System available for retail purchase for the first time.

MKV VW GTI 2.0T FSI

The following data were measured from a 2008 Volkswagen GTI 2.0T 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 a straight through system, with a competitor's exhaust system, and the new APR 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, which makes the tone levels closer to running a straight through system. 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 data is taken from a GTI with a competitor's exhaust system installed, then compared with results from the APR RSC™ Performance Exhaust system. The dominant low frequency tone responsible for drone occurs at 94 Hz and has been significantly reduced with the APR RSC™ Performance Exhaust system by about 20 dB compared to the competitor's exhaust system.

The following graph illustrates the narrowband acoustic spectra for the competitor's exhaust system and the APR RSC™ Performance Exhaust system. Both the dominant tones and the broadband sound levels are quieter for the APR RSC™ system over most of the frequency range, especially around 94 Hz where drone notes dominate.

RSC™ technology provides sound levels comparable or even quieter than OEM exhaust systems at cruising speed. RSC's™ straight through design minimizes back pressure and provides gains greater than other performance exhaust systems. The example shown for the Volkswagen GTI demonstrates the ability to tailor the sound spectra to eliminate drone while maintaining a sporty sound, especially under full throttle.

** Available for 2.0T FSI vehicles including Golf MKV GTI, SEAT Leon and Audi A3 Sport (not quattro).