PRE ORDER FOR NEXT CONTAINER - NO ETA YET RoadsterSport SUPER-Q Single Tip Stainless Steel Premium Adjustable Sound Muffler ND GR-026 61-1732

  • Sale
  • $1,499.00
  • Regular price $1,549.00
  • incl. GST


Helmholtz Chamber Design Means All the FUN, without the DRONE

All the Goodwin RoadsterSport mufflers fit BOTH the 1.5 and 2 litre, either manual or auto transmission. The mid-pipe also fits the 1.5 manual transmission and the 2 litre in either auto or manual. 

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Following the huge popularity of our NC Mazda MX5 application "Q" Muffler this Super-Q for ND is once again "Q" for Quiet version. This attenuation design is a premium "NO-DRONE" choice, great for those with manual transmission and especially for those with the AUTOMATIC transmission (which tends to keep the RPMS in the lower ranges where many exhaust choices drone). Smooth mandrel bent tubing redirects the flow for a side entrance to the muffler where we engineered a three chamber design. It would be much cheaper to just use a single big muffler with nothing but perforated pipe through the centre surrounded by sound absorbing materials, but doing it right with the three chamber design allows us to tailor precisely the FUN sound you want when you push it toward redline, without the harsh drone on deceleration that the more simple designs make you suffer.

This triple attenuation chamber design muffler is the most mild and mellow on an otherwise stock MX5...about 10 to 15% louder than stock...with a deep sporty burble anytime you hit the go pedal but quiet when you are just cruising.

This triple chamber design features an exclusive 'Helmholtz Resonator' first chamber that massively reduces the standing wave inside the exhaust system, reducing the 'booming' tendency by over 50db inside a top up MX5 cabin that is common on many aftermarket MX5 exhausts. To create this Helmholtz chamber we outfitted our 2016 ND Gen MX5 with a computer and sound analyser and microphones and drove it under varying conditions and loads and without the stock muffler for the computer to carefully measure the sound spectrum coming out the stock mid-pipe. We then use that data and some special software to calculate the particulars of the Helmholtz chamber size and valve specs to precisely knock down the frequencies we do not want to hear in the new MX5 while allowing the good throaty burble fun sounds to pass through. The result is deep throaty audio, without the drone!


Due to the carton size we need to deliver these to a business address.  Please contact us to work through the options.