RoadsterSport RACE for MX5-ND
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RoadsterSport RACE


Just 12 pounds!

A Revolutionary Helmholtz Chamber Race Muffler for Max Fun!

PART NUMBER: 61-1733


Reg. Price: $481.85

Sale Price: $419.00



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

Reg. Price: $481.85

Sale Price: $419.00



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


Most FUN Miata race muffler right here, yet not for everyone!

Call it Dual Personality, Call it Jekyll and Hyde, this is the Rebel in our exhaust lineup and the sound level result depends on what you are doing with the gas pedal and the gear selection. Slam the gas to the floor and run for redline and you get a wonderfully throaty throbbing exotic racing rumble with lots of burble that sounds BETTER than an MX5 Cup Car. BUT when you close throttle you do NOT get the drone and cabin resonance of those pure race cars, instead it gets relatively mild on decel and when just cruising in top gear on the freeway. What we have here is the first Miata Race muffler sane folks can really live with every day without pissing off the wife or the neighbors (unless they WANT to).

Continuing with the dual personality, with the top DOWN it makes lots of fun sound as you work the gears, yet with the top up and cruising just a mild purr on mild acceleration and very little drone when you close the throttle or engine brake or run light throttle up hill.

The secret to getting all this fun without the pain of drone on decel is the exclusive Helmholtz chamber included in this design. In fact, this design is ALL Helmholtz and no traditional sound absorbing materials unless you get the optional race baffle.

Tarnish Alert! One downside of making this minimum weight is no fake double walled tip to keep the outside metal looking pretty, you must expect with this single walled choice that it will tarnish with heat because that's what happens to single walled stainless steel. If that will bother you, get any of our other choices that has a double walled tip and weighs more as a result.

How did we do it? We outfitted our 2016 with a computer and sound spectrum analyzer and microphones and drove it under varying conditions and loads with and without muffler. We then use that data and some special software to calculate the particulars of the Helmholtz chamber to precisely knock down the frequencies we do not want to hear in the car while allowing the good throaty burble fun sounds to pass through. In brief, FUN when you want it, and mild when just cruising. The Helmholtz chamber knocks down over 40db of sound in the 120-130 hertz range. That does NOT mean no bass sound, it does mean massive reduction of drone you otherwise get with a straight pipe design

All this in a 12 pound design, a big drop from the 20.5 pound factory muffler. Includes a straight through high flow design from the midpipe out the polished pipe tip for max power.

SHIPPING NOTE...ships factory direct to you. All POLISHED 304 stainless steel construction and LIFETIME warranty. Uses stock hangers and connects to either our midpipe or the stock midpipe.

NO BAFFLE INCLUDED but takes our optional Race Baffle that slides in and lowers sound level for the extra long drives or between racing weekends (baffle sold separate on this website).

Proudly made in the USA, emissions legal in CA and every other State of the Union.

BRIAN'S APPLICATION NOTES: Mild when cruising on otherwise stock ND, delivering a classic sports car BARK and THROATY RUMBLE when you wind it out to redline, lots of fun burble when just playing with the throttle around town. Easily UNDER our local SCCA sound limits on otherwise stock Miata (our SCCA limit here is 93 db at 50 feet and even in the rain our testing found it easily under our strictly enforced sound limits). Also easily under the most strict 92db days at Mazda Raceway Laguna Seca when used on otherwise stock ND. Result is TONS of fun, will make many of you laugh out loud. You also get the best performance from the straightest and cleanest flow out the exhaust cutout you can get, and much lower weight. Nonetheless, this choice is NOT for the faint of heart!!! The most common question we will get on this one is: "will it be too loud" and we cannot answer that one for you because the "right" sound level is a matter of entirely subjective personal preference. We can say our experience with thousands of customers has taught us that Automatic transmission owners prefer our SuperQ choices. And if our RoadsterSport SuperQ is 10 to 15% more sound than stock (depending on use of removable baffle), this RACE is a full 50 to 55% more sound than stock when on throttle, though perhaps just 20% over stock when cruising home in high gear and low rpms. Not designed for use on car with header or midpipe change, designed for max fun on otherwise stock exhaust system. Adding header adds a massive amount of sound, thus we suggest customers considering adding a header should look to our SuperQ choices. The issue with using adjustable length midpipe with this three hanger design is that customers rarely get the length correct and that can put too much stress on the connection between helmholtz chamber and straight pipe, so if you insist on adding midpipe with this design be careful to get length of midpipe accurate (hangers aligned nicely straight up and down for midpipe) and use thicker hanger from the rear to better support the bigger midpipe.

Slant cut to dress it up just a bit!

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

Note the RACE does not include any baffle but we offer an OPTIONAL

Packed Baffle that gives you the ability to quiet it down significantly. Adding our RoadsterSport Midpipe doesn't change the character of the sound but adds ANOTHER 20% more sound over and above what you get with the RoadsterSport Race. Below is a sample of that sound combo of our RoadsterSport Midpipe and this RoadsterSport Race muffler courtesy of our own Ryan Passey:


Installation of this Miata exhaust is SUPER EASY using the stock hardware already on the car...just two stock 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 unscrew the studs, 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. 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 on that very special stock high density ball socket gasket, so please do not add sealants that will gum up that dry ball socket joint. Our pipe size is bigger than OEM for best flow, that means the stock donut gasket sinks a bit deeper than with factory muffler. Our flange is designed as a dual purpose item that allows going to flat gasket if you later go 2.5 inch midpipe, at which point the midpipe has a flex joint to replace function of the donut. After install hold you hands about 2 inches from gasket connection with car running to check if you feel 'puff puff puff' indication of leak against your hands, if you do check your install or replace the factory gasket (our item 61-2144, factory part number RFK2-40-581 )

Local Fast Buddy Jeff Cawthorne laying down fast time in his new ND. Our RoadsterSport Race muffler adding some sound!

And leaving the line at SCCA autocross event:

Another Great Customer Video

Finally, TWO customers with this Race muffler, one following the other on the sort of fun canyon drive that Miata dreams are made of!

Dyno Results! From Grassroots MotorSports Magazine's testing, 8 hp from just a muffler on ND1...when the muffler is a straight pipe design like RoadsterSport Race and SuperStreet Single Tip and SuperStreet Twin Tip.


Packed Baffle Insert for RoadsterSport SINGLE TIPS.


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Customer Reviews

RoadsterSport RACE

This exhaust turned out to be exactly what I hoped it to be! Loud and fun when on throttle and quiet and not much louder than stock when cruising in 6th gear. The best part is that the tone of this exhaust is not your typical "straight pipe" ricer sound. It is a much more refined and "grown up" tone that actually sounds great for a 4 cylinder engine. It is a perfect match for this car and has really injected so much more personality into the car than I ever expected. Cant wait to take the car to the blue ridge mountains in a few months and hear that exhaust echoing on the rock walls and tunnels! Some say it can add an MPG or two, but so far mine has gone down by one or two MPG. But that's just because I want to hear that exhaust haha.

The exhaust came well packaged and had no damage on it upon delivery. I was really impressed with the build quality of the system, as the welds are beautiful and the fit on the car was perfect. I put a metal coating product from AMMO NYC on the single wall tip, so hopefully I can mitigate the tarnishing over time. Super easy install once you get some soapy water on the exhaust hangers. Probably only took 20-30 min total to swap out the stock muffler. Would definitely recommend this exhaust to anyone looking to extract that sports car sound, but could see how it is not for everyone.

One of the best purchases I've made for my MX-5, and my only regret is not buying it sooner. The exhaust is only loud during cold starts and full throttle. Otherwise, it is only slightly louder than stock if you are cruising along. It wakes the car up and makes you want to drive.

The exhaust is significantly lighter than the OEM exhaust, construction is top-notch, and shipping was three business days after I purchased it online. No supply chain issues with Good-Win Racing.

The hardest part of the installation was removing the rubber hangers, but some soapy water did the trick. After that, it is only two bolts to remove. You don't need to jack the car up. I did the installation in my apartment garage in about 30 minutes.

Before getting the exhaust I was hesitant and I did my research and looked up videos and I called different places in the Escondido and they were going to charge me a few hundred to install it and Rockys Miatomotive was less than a hundred to install it and he was quick to install it and was an interesting person and when he first turned the car on after installing the exhaust I knew I made a great choice and I drove the car home back to the Escondido area and it was phenomenal the sounds was nice especially down shifting to third and second at mid-high rpms, I had the install for a month now and has been great I have noticed it has saved me MPGs as well about 1.3 but I have an AEM Filter too and drive it well lol but great exhaust tone nice not raspy or obnoxious but performance tone, satisfied with purchase, the exhaust was a little dusty when I looked at it but I cleaned it with a Mirco cloth and it was all good. :)

Always the highest quality from you guys. And I mean always. I pulled my other exhaust I got from you out and then I realized that I needed to extract studs and switch them over to the other exhaust. I sat up with the exhaust in my lap and the studs came out with fingers LOL zero rust. I just love things made by people that appreciate quality. It is literally a 5-minute swap Jack it up couple of jack stands bing bang boom.

Okay well Fair notice I do have the large mid pipe and header system so I installed this Muffler just to mess about with my friends. When we go to J D M Meats I slap it in for the smile that gives me but it is super loud this way. Oddly enough even with it being ridiculously loud when you get on it it is quiet on the highway. The Herzog chamber technology is truly incredible. I pulled it off my car and put my original super q from the set I purchased here back on my car and let my friend with a 2017 install it and his is superstock nothing done to it and it sounds really good. Really good 👍

Now if you do have headers and the high-flow mid pipe like I do it is obnoxiously loud when you really get on it and cold start. But boy is it fun LOL. You can't feather it out and drive Ultra soft and it is almost not noticeable but once you get on it it's as loud as it can be. Like I said very fun.

This is a thing of beauty. The sound is perfect. Thank you.

Very quick delivery and installation was a breeze! It took all of 15 minutes to put on and I'm amazed at how the sound is perfection. It has an exotic tone to it. Would DEFINITELY recommend as a starter muffler if you're not ready to do the full header-back setup right away.

Installed this on my daily driver with a baffle. Very easy install. Excellent fit and finish. Amazing Jeckel and Hyde sound. Short shift in the neighborhood and it's very civilized; run it out past 4K and the fun begins. Love this sound! Thanks Goodwin!

Installed my RoadsterSport Race over the weekend and I can't say enough how much I absolutely love it!!! It reminds me of the sound of my old "71 ALFA spider, but cleaner and more tuned. It sounds like the ALFA was sent to a recording studio with a professional sound engineer instead of a home recording, in the basement, with an old tape deck.

Good-win Racing, you have without a doubt done justice to ND Miata.

Bought the Roadster Sport Race for my RF, very happy with it. I would like it to have a little burble on decelerations and down shifts but other than that it sounds great. No drone at all, just loud enough, not too loud for any environment, neighborhood or around town.

I purchased this muffler right when I saw the "PREPAY" option a month after the last batch got sent out, it took about a month for it to get here, but only 3 days when they got them back in stock. You'll need a 14mm and a 13mm socket wrench and some dish soap for the hangers, that's it. Very easy to install, took me longer to find the right attachments for the wrench than anything, as it needs to be longer to fit around the end of the threads and reach the actual nut. The sound is very clean, not loud enough to be obnoxious, but it will definitely grab attention. If you wanna just make noise you'd probably opt to add their midpipe as well. Acceleration feels smoother and the ride is much more enjoyable, all around an amazing product, however, one thing I noticed is that when I was finishing tightening up the nuts on the springs, it just stopped tightening, that aspect was very weird to me, as I didn't know whether to keep tightening or to let it be, the connection didn't have any room to knock or move around, so I figured it was fine. Honestly, I feel like the connection to the factory midpipe isn't the best, despite being very close to the stock muffler, but the hangers will hold it in place so it's nothing to worry about. Great customer service btw, if you have a question, send them an email! They respond very quickly, the same day every time I sent an email.

Love, love, love, love it!! The Race is as described. Mild when driven easy, throaty and exotic when pushed hard. Exotic is the definitive word!! Smiles per mile have easily doubled!! I was also impressed with how well it was packaged from the factory. Nice job!! Well worth the pandemic wait!!

This product surpasses the blurbs about quality, fitment and performance. The sound is excellent (if just a shade loud on acceleration!) and as mentioned, the cruising drone is gone (I did install some Noico sound deadening material just to make sure. Trunk bottom functions as a soundboard!) As usual, service and shipment have been excellent! Good products, good service, good prices! Very pleased.

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