RoadsterSport STREET SINGLE MX5 Miata Muffler, Just 12 pounds! for MX5
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RoadsterSport STREET SINGLE MX5 Miata Muffler, Just 12 pounds!


PART NUMBER: 60-13262


Price: $299.95



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

Price: $299.95



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


This MX5 Miata Muffler was designed for both RACING...and STREET. Our original RoadsterSport "RACE" Miata Muffler is an amazing 8 pounds and designed for the autocross and track MX5 Miata drivers who need to meet sound limits in the low 90 DB range with absolute minimal weight. Our 8 pound Race has also been a big seller with our younger MX5 owners seeking to make a statement and have some fun with their street use. However, many asked us to make another single more focused for the street users... a fun single Miata Muffler that is more subtle than our 8 pound Race wonder...but almost as light. That turned into a tough challenge and after many prototypes you see the production version here.

Why a single for street users? Let's face facts, dual exhausts on a straight four cylinder Miata is a ridiculous waste of weight for the serious sports car enthusiast (Mazda talks about gram strategy in the development of this MX5 but they wasted a lot of weight on duals that provide no performance benefit over singles YET lots of extra weight).

Just 12 pounds means this MX5 miata muffler is 15 pounds less than the stock MX5 miata muffler! How do we do it? For this design we started with our 7 pound Race and added more diameter filled with sound suppression materials and we separated the sound suppression chamber into THREE internally baffled chambers for sound wave attenuation in what is still a highflow design. By using a higher than normal perforation rate on the super high density core, WITH three internally baffled sections, we get absolutely minimal weight and sound for a 12 pound single.

This 12 pound Miata exhaust compares with 19 pounds for our RoadsterSport II Duals and over 26 pounds for the factory exhaust. Designed to accept our glass packed baffle insert to quiet it down more if you like, which is sold separately. SHIPPING NOTE...ships factory direct to you. Final is All POLISHED stainless steel construction and LIFETIME warranty. Uses stock hangers and connects to either our midpipe or the stock midpipe. Proudly made in the USA. Includes mounting gasket and hardware.

BRIAN'S APPLICATION NOTES: Rather mild when cruising on otherwise stock NC, delivering a classic sports car bark when you stick your foot in it...tons of fun, better performance, and much lower weight. Nonetheless, even this big STREET single is not for the faint of heart. The most common question we 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 Q is 10 to 15% more sound than stock (depending on use of removable baffles), and our RoadsterSport II is 15 to 25% more sound than stock, this STREET SINGLE is 30 to 45% more sound than stock on otherwise stock NC (substantially less than our RACE Single which is a full 50 to 55% more sound than stock).

This STREET SINGLE is also a great RACE TRACK and Autocross choice for those running beyond stock class with performance headers or superchargers and needing more sound suppression in a single than our 7 pound Race (but daily driven STREET drivers with headers and superchargers will likely want the RoadsterSport Q instead!). Popular with manual transmission soft top owners, not recommended for those with automatics or PRHT. Yes, this takes the same OPTIONAL Packed Baffle

Sound Files at our Exhaust Blog

OCTOBER 2012 Update: New Tip Design! Had many requests for a new thicker rolled tip for our Street Single. Yes, still works with our unique removeable baffles.

COMPARISON of STOCK MUFFLER with STREET SINGLE on otherwise stock cars.


Read full installation hints and notes in our forum Installation Instruction Section! --- CLICK HERE TO READ MORE. The secret is LUBE your hangers well with dishsoap so you can get flanges aligned properly, and torque the supplied hardware to NO MORE THAN 25-30 ft/lbs (using more torque will actually result in LESS seal because you will pucker the flange out at the middle).

Customer's video of 2.5L RoadsterSport 1.8 catless header, HH midpipe, Street Single w/o baffle.



Customer Reviews

RoadsterSport STREET SINGLE MX5 Miata Muffler, Just 12 pounds!

This GWR street single is the perfect exhaust for the Miata ! Now it sounds like a sports car! Better performance too!.

Perfect sound for me, not too loud not too quite with growling sound. Single tip design gives me extra room to work on rear wheel parts. I used wd40 and rivet plier type remover to remove stock exhaust rubber.

The old one fought coming out, so definitely get yourself a hanger removal tool. Worth it.

The muffler itself is good looking and well crafted. Its loudest at idle. A bit more than I hoped, but it should mellow. Otherwise, its noticeable and nice, but not overwhelming.

I am having a problem with exhaust leaking out of the flange. If there is a more malleable gasket that seals better I would use it.

Pulling the old muffler does leave a big empty space underneath, and you can bring home ice cream in the trunk now.

Bought a new Miata (to me) and as soon as I got home I ordered this. The stock muffler just left me disappointed with the new car as I had owned this muffler on a previous NC I had and knew that it was the perfect amount of noise for this car... not to loud, not to quiet (stock) and it saved some weight! Goodwin is always my go to spot for my miata upgrades! Extremely simple install and satisfaction was immediate upon startup!

Fit & finish couldn't be better, installation was easy & the loss of excess weight is always a plus. With the stock header & mid pipe, you can actually hear a car instead of a sewing machine. Sounds nice, not loud enough to get you pulled over or irritate your neighbors if you are out late, even with the baffle removed. I may have to order the header and mid pipe... Thank you GWR! Nice stuff, great service & your videos are well done & enlightening.

Recently purchased the car and it had the Roadster Sport Dual, which sounded nice. We wanted just a little more sound, and this single nailed it without being too loud. After being on the car for a few hundred miles it has gotten a little throatier, which is just about the perfect amount. Also, the quality is top notch! I'd purchase again.

I have already give the RSS a review but the one thing no one has stated is that after about 1500 miles the muffler brakes in it has a drop in tone. I'm using on 2.
5l PHRT with no complaints great sound on and off throttle.

Got this to round off the complete exhaust system from 1.8 header to mid pipe with converter on a 2.5 swap sounds really good. Just finished 1100 mile road trip and all works very well never got to be to much hard top up.

having grown up in the muscle car era and exhausts that actually produced some sound, I needed to do something about the non-existent exhaust sound of the MX-5. The Street Single peaked my interest as it provided a straight through design with a single outlet very similar to the classic designs of the 1960's British sports cars I use to own and the Cherry Bomb mufflers I use to love as a young adult. Of course, I read the review. Listened to the Youtube clips. And heard people say it's too loud for street use, especially on an automatic. Nonsense! This is the perfect muffler for the Miata. This should be the standard muffler or at least a factory option for the car. It gave the car the deep throaty sound it so desperately needs. For me it reminds me of the deep mellow tone of a 60's-something Austin-Healey 3000 or Jaguar XK-E. I use my Miata for my daily commute (40 miles each way) and most of that is on Interstate highway. In no way is it too loud or produces what many call a 'drone'. I love it. If you want something quieter than this baby, I'd suggest staying with the stock unit. I totally agree that there is no need for dual exhaust on this car with a single down pipe. unneeded weight. unneeded complexity.

I got the Good-Win Racing Street Single exhaust installed a few weeks ago and I'm very happy with it. I was actually surprised by how quiet it was as I was expecting a "barely streetable" exhaust but it is very tame by my standards anyway.

Build quality is excellent. Very nicely polished stainless.

The price for this exhaust is very reasonable and I consider it a value purchase.

That stock exhaust is a freakin' monster but it came out easily by lubing up the hangers and using a breaker bar as a pry bar to push the hangers off the stock muffler supports.

Install was super easy--stick the two supports in the stock rubber hangers--again easy with lube. Position the exhaust to square up the muffler and exhaust tubing flanges and two bolts. It is a good idea to re-torque the bolts after an hour or so of driving on the new exhaust.

I really like how Good-Win was smart enough to put the can on the passenger side of the car to help balance it. Removing 15lbs from the absolute tail of the car also helps the car's handling by reducing the polar moment.

The exhaust tone is excellent with a nice deep rumble at idle and more of everything at upper rpm but it's not annoying at all. If this thing had a volume control I'd turn it up a little (I'm coming from an S2000 race car).

There is no drone at all.

Two thumbs way up for the Street Single exhaust.

Received RSS 3 days after ordered it. The build and finish of muffler is very nice. There is no instruction come with the part. I was able to find some installation instruction online. It is also helpful from Brain's exhaust blog write up. Thanks to my best friend Steven C. who has some experience in installation of RX8 exhaust. It took him about 1 hour to install it. The most difficult part of installation is remove the factory muffler from hanger. Hand wash soap helps a bit to lubricate and reduce friction of the rubber hangers. The RSS fit perfectly to the factory mid-pipe. We reused the factory gasket. There is no leak after installation. The sound of the RSS is just right. It sounds very classy. Very deep sound. I personally don't like loud exhaust like Harry Davidson motorcycles. The muffler provides sound almost like deeper sound of Infiniti G35. Sweet spot of the muffler is at 3000 rpm. The appearance is perfect. Since NC1's rear bumper doesn't have the obvious cut of 2 holes, it looks like factory quality. I am not sure about the Q muffler. However, if you worry about too loud, it shouldn't be. My 3 years old son enjoys it as well. He hates loud noise. You can't find better muffler than this. Appearance, ease installation, sound, weight reduction, price and customer service all 5 stars. Thanks Brains coming up with a perfect product.

When I bought this vehicle for the wife last year, I had already heard all the stuff about NC models losing touch by adding weight. I agreed. I never understood the need for dual exhaust on a 4 cylinder motor. Also, never heard any aftermarket duals worth 400+ dollars to add little sound quality, let alone be lighter. Then I found the Street single. THIS IS THE WAY THE CAR SHOULD COME FROM THE FACTORY.The tinny staccato becomes a full sound, zero drone on accel and the little you get on decel is a non issue IMHO even with top up. It makes it sound like a sports car instead of an econo box.You do notice the 15 lbs it removes from the tail. The wife loves it and I'm not even using the baffles (I'll save those for the header next season). Weight is the enemy, this exhaust defeats the enemy!

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