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RoadsterSport RACE Stainless Steel Muffler for 2016+ MX-5 Miata

RoadsterSport RACE Muffler for 2016+ MX5 Miata
MSRP: $481.85
Price: $419.00
You Save: $62.85 (13 %)
Item Number: GWR-RS-RACE-ND
Manufacturer: Good-Win-Racing
Manufacturer Part No: 61-1733

Good-win Racing Logo RoadsterSport
RACE Muffler

2016+ MX-5 Miata

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 MX-5 Cup Car. BUT when you close throttle you do NOT get the drone and cabin resonance of those pure race cars, instead it gets mild on decel, downright quiet 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).

RoadsterSport RACE for ND

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 no 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 they do it? Goodwin Racing outfitted a 2016 with a computer and sound spectrum analyzer and microphones and drove it under varying conditions and loads with and without muffler. 

RoadsterSport race for ND

They then use that data and some special software to calculate the particulars of the Helmholtz chamber to precisely knock down the frequencies you 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.

All this in an 11 pound design, which is about half the weight of the 20.5 pound factory muffler. Includes a straight through high flow design from the midpipe out the polished pipe tip for max power.

RoadsterSport RACE for ND Scale

Slant cut to dress it up just a bit and drop weight to even 11.0 pounds!


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.

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


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. However, 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. Works well with factory midpipe and our RoadsterSport midpipe, NOT recommended for customers changing header (see our RoadsterSport SuperQ for Header.)

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.


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.



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