Active Exhaust with CARB Catalytic Converter

THE single most powerful bolt-on CARB approved catalytic converter for your SC or Carrera.  The active exhaust valve is activated by engine load, opening during aggressive dips into the throttle.  YOU decide the sound characteristics of your 911 by your driving style and choice of main muffler.  Tailpipe silencer cuts the sound level of the open valve in half should you desire a less aggressive note when you get on it.  This system is STOCK QUIET during idle and cruise with a SPORT SOUND under acceleration.  Designed using a dyno, this system partially waste gates exhaust flow at the optimum ratio for peak performance.  The tailpipe silencer was also designed using the dyno to silence the flow just to the point where performance gains began to drop off.

Active Exhaust With CARB Cat is designed for use with all impact bumper Porsche 911 1978-1989 models having OEM heat exchangers and requiring a CARB approved catalytic converter (#D193-134) for use in California.   Weight is 8 pounds.  This muffler is designed for ultimate performance and sound using THE least restrictive catalytic converter cartridge along with an F1 style merge collector, straight through 2.5″ flame tube, heavy duty vacuum activated valve and oversized exit flange.  O2 sensor is located at the F1 merge for optimal reading of all cylinders.  When installed on the Carrera this product alone will match the performance increase seen when converting from the OEM exhaust system to standard 1.5″ SSI heat exchangers.  Sound level when valve is closed is the same as OEM catalytic converter.  Active Exhaust comes with everything needed to install.  See INSTALLATION INSTRUCTIONS tab for helpful hints.  Complementary products are our MKM33 Single Outlet muffler or MKM73 GT3-Look muffler.