RoadsterSport SUPER-Q Stainless Steel PREMIUM ADJUSTABLE Sound MX5 Miata Exhaust for MX5-ND , all
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RoadsterSport "SUPER-Q" Stainless Steel PREMIUM ADJUSTABLE Sound MX5 Miata Exhaust

2016-2020 · all

Helmholtz Chamber Design Means All the FUN, without the DRONE

PART NUMBER: 61-1732


Price: $539.00



Free shipping offers apply only to destinations within US Lower 48.

Price: $539.00



Free shipping offers apply only to destinations within US Lower 48.


Following the huge popularity of our 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 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 center 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 decel that the more simple designs make you suffer.

This triple chamber design muffler is the most mild of our choices and mellow on an otherwise stock MX5 Miata...about 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 Miata cabin that is common on many aftermarket Miata exhausts. To create this Helmholtz chamber we outfitted our 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. 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 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.

Yes, simple BOLT ON install, just two bolts!

Includes our 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 our 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:

INCLUDES our exclusive baffle cone insert in the Tip which is REMOVEABLE and allows you to set the sound to sporty...or quiet. Also available is our 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 MX5 Miata exhaust system....and only 20% over stock sound level when used with our RoadsterSport midpipe. Works great with stock midpipe or RoadsterSport Midpipe. Customers planning a header are encouraged to wait for 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.

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.

Ride Along with our RoadsterSport Q in Launch Edition owned by local customer Mark Booth below, big thanks to Mark for the great video!


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. Our flange is designed as a dual purpose item that allows going to flat gasket if you later go with our 2.5 inch midpipe, at which point the midpipe has a flex joint to replace function of the donut and you get a clean 2.5 inches of flow all the way, which is not possible if we stay same small pipe of stock muffler.

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.




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A Revolutionary Helmholtz Chamber Race Muffler for Max Fun!

Stainless Steel ADJUSTABLE Sound MX5 Miata Exhaust




Customer Reviews

RoadsterSport "SUPER-Q" Stainless Steel PREMIUM ADJUSTABLE Sound MX5 Miata Exhaust

My first try at an aftermarket exhaust was the RoadsterSport Race from Goodwin Racing. After 1 month, I was finding the sound to be too loud for my taste.

I ordered the Super-Q single tip and was immediately impressed after the install. I'd argue that this is the exhaust that should come standard with all new Miatas- no obnoxious sound, no drone. If you leave the baffle inserted, it sounds just a bit louder than stock. I removed the baffle and found this is the perfect sound- you can still get a mellow "burble" when you lay off the gas and a deep note when laying on the gas (I'm finding 5,500 RPM as the ideal shift point/sound note).

Note- When I removed the baffle there was a scuff mark on the interior wall. My solution was to hit it with a little Rust-Oleum High Temp paint.

In summary, I highly recommend this exhaust option for those who just want a better sounding note than stock without the "boy racer" sound that comes with other systems.

With only 2200 miles on the car when I bought it in October 2018, there was no rust or even evidence of water so the two exhaust bolts came undone easy as pie. Dish soap and water in a spray bottle did the hangers, I used a channel lock pliers to get the rubbers started over the bump. I used the very ample packing material to support the new muffler as I installed it; being up on jackstands for other work was a big help. Everything went back together smooth as silk. My other work is ongoing so I've not yet fired it up but by all appearances I am very satisfied and fully expect to remain so. Many Thanks for another sweet Good-Win purchase!

I have previously installed Mazdaspeed and Borla exhausts on my NB & NC MX-5's. Goodwin has the Roadstersport exhausts locally produced in SoCal, and the quality, fit & finish is excellent. I had no issues with installation, hardest part is wrestling the factory rubber hangers off the stock system.

The tone and resonance of this system is a little more subtle than the Borla, and sounds much better than the stock exhaust, slightly louder under throttle without being irritating. I can match shifts to the engine by sound without looking at the tach. Great exhaust.

Super Q. Immediately removed the restrictor as I wanted the sound a bit louder. Did not buy the extra baffle and can't imagine anyone using it. Just about right now. Been driving it for a few weeks and am very satisfied. Only slight detraction is a sort of metallic ring at 3500RPM. Solution? Go faster!

Just put the Super Q on. Well, actually, I had it put on. After a couple of times failing with the various techniques for pulling the stud, I took it to my local shop. They waived their rule about installing personal equipment. About 30 minutes later I was out of there. What a difference a lift, knowledge, and air tools make. Thank you guys.
Already I know I love the Super Q. I waivered between it and the Super Street. I think I got the right one for me. Nice low mellow sounds, with a touch of anger. And this is without yet having tried without the baffle.

I recorded some audio of "before". I hope the before and after come out to post on the Miata forum.

Thanks Good-Win

After falling in love with the SuperQ on my NC and the RoadsterSport III on my track NB, I decided to get the SuperQ for the ND.

It's the same great quality you would expect from Goodwin Racing. The fit and finish are superb. And it looks fantastic.

Right after install, the sound is a bit deep and undefined (didn't hear a lot of character). As it's breaking in, I can hear it evolve into a rich, playful sound. I like it a lot so far, even though I've only had it for less than 100 miles. Will post an update once I've driven it longer.

Installation note: When removing the stock muffler, one of the stock studs was stuck / seized onto the flange. I tried WD40 and PB Blaster and vice grips - but no luck. I eventually called the friendly folks at GWR and they suggested the following method, which worked like a charm:

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