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RoadsterSport "SUPER-Q" Muffler for 2016+ MX-5 Miata

RoadsterSport "SUPER-Q" Muffler for 2016+ MX5 Miata
RoadsterSport "SUPER-Q" Muffler for 2016+ MX5 MiataRoadsterSport "SUPER-Q" Muffler for 2016+ MX5 Miata InstalledRoadsterSport "SUPER-Q" Muffler for 2016+ MX5 Miata TipRoadsterSport "SUPER-Q" Muffler for 2016+ MX5 Miata Dyno
MSRP: $911.38
Price: $792.50
You Save: $118.88 (13 %)
Item Number: GWR-RS-SQ-ND
Manufacturer: Good-Win-Racing
Manufacturer Part No: 61-1732
Good-win Racing Logo RoadsterSport
"SUPER-Q" Muffler

2016+ MX-5 Miata

Following the huge popularity of Goodwin Racing's NC application "Q" Muffler this Q for ND is once again "Q" for Quiet version. This attenuation design is a premium "NO-DRONE" choice, great for those who want a more throaty sound than stock but still mild. 

Smooth mandrel bent tubing redirects the flow for a side entrance to the muffler where they engineered a three chamber design. It would be much cheaper to just use a single big muffler with nothing but perforated pipe through the center surrounded by sound absorbing materials, but doing it right with the three chamber design allows Goodwin Racing to tailor precisely the FUN sound you want when you push it toward redline, without the harsh drone on decel that the more simple designs make you suffer.

RoadsterSport "Super-Q" for NC

This triple attenuation chamber design muffler is the most mild of our choices and mellow on an otherwise stock MX-5 Miata...about 15% louder than stock...with a deep sporty burble anytime you hit the go pedal but quiet when you are just cruising.

RoadsterSport Q for ND Detail

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 Miata cabin that is common on many aftermarket Miata exhausts. To create this Helmholtz chamber Goodwin Racing outfitted a 2016 ND Gen Miata with a computer and sound analyzer 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 midpipe. 

They 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 you do not want to hear in the new Miata while allowing the good throaty burble fun sounds to pass through. The result is deep throaty fun, without the drone!

The Helmholtz chamber gives this muffler a dual personality, under decel it is super mild and quiet, yet when you push hard toward redline it gets more fun and racy! With the top down lots of fun throaty burble, but dramatically more tame when the top is up. 22 pounds. In brief, FUN when you want it, and yet totally mild when just cruising top up.Simple BOLT ON install, just two bolts!

Includes the famous RoadsterSport Super Light 3.5 rolled tip originally developed for NC application. It took a big investment in new equipment to come up with a rolled tip that didn't add weight to their high flow performance designs...but it was worth it. This 3.5" OD outlet tip completes the look of the exhaust and provide a more aggressive and sporting appearance than the very tiny pair of of polished pipe outlets used on the factory muffler:

RoadsterSport Tip for ND

INCLUDES Goodwin Racing's exclusive baffle cone insert in the tip which is REMOVEABLE and allows you to set the sound to sporty...or quiet. Also available is an optional packed baffle with which you can quiet it down even more. This system is 10% to 15% louder than the stock Miata muffler on an otherwise stock MX-5 Miata exhaust system....and only 20% over stock sound level when used with the RoadsterSport Midpipe. Works great with stock midpipe or RoadsterSport Midpipe. Customers planning a header are encouraged to wait for a special Header version of this SuperQ that adds additional resonator on inlet side to better handle the raspy sounds unleashed by a header swap which will be released about the same time as our header. Baffle retained by small hex bolt inserted from well under each tip.

Proudly made in the USA with a LIFETIME WARRANTY, emissions legal in CA and every other US State. Fits all 2016 and newer Miatas with manual or automatic transmission, soft top or retractable hardtop.

This Miata exhaust is guaranteed for as long as you own your Miata.


Installation of this Miata exhaust is SUPER EASY...just two 14mm bolts to loosen! When you open the big box you will find separate foam wrap on the exhaust tip, leave that foam around the tip during your install to protect the polished tips and your car's soft plastic in the exhaust cutout. Use gloves. Note the 'bolts' from the factory are actually studs with springs and nuts and the factory usually jams the nuts on so hard that unbolting it will bring the stud out too. If that does not happen then use a 13mm long socket to pull the stud, or use jam nut technique where both nuts are put on one stud against each other and then wrench used on the inner of the two to back out the stud. Then lube up the stock exhaust hangers with dish soap and yank stock muffler back and forth to work the soap into the rubber hangers and then the muffler will slide off those rubber hangers easily. Then hang the new muffler on the wet and soapy rubber hangers and torque 'bolts' with the springs back in place to 30ft/lbs. Now you can remove foam tip wrap. Option to remove the baffle too, to do so loosen bolt that holds it from under the exhaust tip and use it as handle to shake the baffle loose and then unscrew bolt the rest of the way and pull the baffle (pulling baffle raises the sound slightly). Note the muffler to midpipe joint is a ball socket connection for the first time on a Miata, it is designed to move a lot, so please do not add sealants that will gum up that dry ball socket joint.


  • Lifetime Warranty

  • All Stainless Steel 

  • Dyno tested and proven to make power

  • Performance gains in horsepower and torque 

  • Mild Deep Sound with NO Decel Drone

  • Smooth Mandrel formed tube for max flow 

  • User Adjustable sound level using included removeable baffle

RoadsterSport Q for ND Dyno

Dyno report! Peak torque gains moving up from 136 to 139 FtLbs and peak hp up from 142 with stock muffler to 145 with the highflow muffler. Best torque gain is 5+ Ftlbs torque in the midrange right where most folks are driving. Much more testing to come.


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