A Revolutionary Helmholtz Chamber Race Muffler for Max Fun!
Stainless Steel ADJUSTABLE Sound MX5 Miata Exhaust
PART NUMBER: 61-1733
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.
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 stainless steel construction and LIFETIME warranty. Uses stock hangers and connects to either our midpipe or the stock midpipe.
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!
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:
BRIAN'S INSTALL NOTES:
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.
MIATA MX5-ND 2016-2021
* FREE SHIPPING
MIATA MX5-ND 2016-2021
* FREE SHIPPING
MIATA MX5-ND 2016-2021
* FREE SHIPPING
MIATA MX5-ND 2016-2021
* FREE SHIPPING
This exhaust is exactly what I was looking for. It's just the right amount of loud but with a very racy sound. By putting nothing but the muffler on my car sounds like it has a very expensive exhaust system.
It's not super loud and it's not raspy so if that's what you want keep looking. I watched a lot of videos and most of them I didn't like the sound at all but in person it sounds high end and doesn't have the cheap car sound.
I also bought the baffle just incase it was too loud, with it in the exhaust sounds almost stock but maybe just a touch louder but with a little better tone. If I get headers and a mid pipe later I think the baffle will be perfect.
After receiving my RS Race, I was thrilled by the sound but had some boominess around 3K rpm. I used Noico 80 in the trunk which virtually eliminated it! I highly recommend using this or dynamat in the trunk well as it reduces the resonance while keeping all the great sounds. Now it sounds exotic with burbles down low and screams up top without having to stay out of that rpm range! I'm glad I went with the Race instead of the Street single. Not obnoxiously loud at all. You can play the exhaust like an instrument! Absolutely beautiful build quality! I bought the insert but leave it out as it seems to lower the volume but at the cost of the awesome tones down low. If you are on the fence, go for the race! Wife approved!
I have the twin tip super street. I love it but I really didn't like the can sticking out of the back of my car so I got this too. It's smaller, much simpler, similar tone even though it's a little bit louder. I did however notice on the SS that as the carbon builds up it get quieter. I may put the baffle the race and sell the SS. My car is a daily so I need it to be quiet at times. I couldn't be happier.
The weight savings is a great advantage too.
Took a while to get the exhaust due to Corona but it was definitely worth the wait. The exhaust was packaged well so no damage. Its a lot lighter than stock and sounds great. Below 3 grand its quiet enough for cruising and above 3k it really comes alive and sounds amazing. Love this Roadster Race Exhaust.
Exhaust was well packed. Installation was super fast-20 minutes. My car is brand new, so no siezed bolts/corrosion-which helps. 3 tips: 1) When breaking loose the studs connecting the mid pipe to the factory exhaust, use a fast, hard motion to quickly break the studs free instead of trying to wrench them out with steady pressure. The studs seem to come out easier that way with less chance the the nut will loosen instead. 2) get an exhaust hanger removal tool from Amazon-well worth the $17. Use WD-40/soapy water/etc on the exhaust hangers for removal and installation of the new muffler.
The exhaust sounds really great, exactly what I was looking for.
Amazing product. Sound and volume is just right (for me) and as advertised does not have an ounce of drone at steady speeds, pure wizardry. This might be a touch too loud for some people on full throttle, but just try it once in a tunnel or overpass and you might change your mind. There's definitely a reason it's been on back-order for as long as it has, can't beat it for the price or performance.
This is an excellent choice for adding more fun and it sounds great. The install was easy and I had no issues. It is not that loud or too quiet. With this muffler, it sounds like a real car. Highly recommend.
These cars should come like this from the factory! I just have this muffler on the car and the rest of the exhaust is stock, but I love the sound. It burbles down low and has a great sound as you wind the engine out. It does drone a little bit when the revs are low, but on the highway, there's virtually no drone and it's easily something I could live with everyday. I would highly recommend this part!
For my decades of purchasing aftermarket exhausts, my RoadsterSport RACE exhaust purchase has been my most satisfying aftermarket purchase. From the ease of install, quality of the materials and the perfect sound, I am very happy with my RoadsterSport RACE exhaust. At first I had been concerned that the exhaust would be too loud or droney; much of my aftermarket exhaust experience have been with various Mustang models and none of those experiences will translate to this exhaust. In fact, I would not mind if the exhaust were even more aggressive, so I am considering the mid pipe purchase now. When I first removed the exhaust from the box, I was very worried, its essentially as straight pipe with the special chamber, but I soon discovered, it works wonderfully!
I have driven the RoadsterSport RACE for several thousand miles now and the nice tone is always enjoyable top up or top down. My last worry was also the sound would have a punk kid Honda civic sound, not at all. I have also noticed an increase in top end power and I believe my gas milage has improved almost 1 MPG. Thank you, Good-win racing for an excellent quality and designed product!
My ND2 got its Roadstersport Race (RR) when it had about 300 miles on it. It's really pretty awesome. Soundwise it gets it just about perfect. I can drive out of the neighborhood and not piss off everyone while warming up the car. But at the same time it sounds like business. Stick yer foot in it and it barks. There's enough high frequency to get that good ripping sound, like a 4-cylinder bike that's not quite as loud and doesn't rev as high - a lot like a detuned Ford BDA if you remember what Ford-powered Atlantic cars sound like. The sound bounces off of buildings, underpasses and tunnels the way it should and downshifting sounds great, with just a hint of crackle. It's not so loud that you'll get tickets, but I suppose you'll eventually get noticed by the natives if you are late-braking and downshifting into the same corner in the same old Maryland settlement every day, then planting your foot in it because the sound bounces off the old buildings in a righteous way that ought to happen more often. It's not good for critical music listening, but I didn't buy the car for that. As far as the performance stuff goes, the dyno sheet Goodwin touts is one thing, but another less obvious advantage is that it takes a pretty cheap significant chunk of weight out of the car. While the weight is low, it's pretty far away from the car's center of mass, so it's worth it. Weight is the enemy, so get it out wherever possible.
Installation was really easy. Lubricate the rubber mounts on the old muffler with dish soap. Remove the mounting bolts / studs whatever ya wanna call em. Put a small block of 2X 4 next to the old muffler and pop the rubbers off the hangars with a big screwdriver. Stick the grin-inducing Roadsterport joybox on the mounts and screw the bolts / studs whatever ya wanna call em back in place. 30 minutes to fun!
It's perfect! You can play it like a musical instrument. Quiet when you're cruising and yet sounds like an exotic sports car when you rev it out. Really adds to the driving enjoyment. Easy install. Excellent fit, finish and packaging.
After the first 5000 miles with the stock exhaust, I decided to change. I don't do track or autocross, but we have lots of nice twisty roads in my area.
So far, the race is just what I want. I can baby it when I don't want to sound obnoxious, but for spirited driving on twisties it sounds so much better than stock!
Here is a video of my first real drive with the race: https://youtu.be/2X548gMvPD4