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RoadsterSport SuperStreet Muffler TwinTip for 2016+ MX-5 Miata

MSRP: $1,033.85
Price: $899.00
You Save: $134.85 (13 %)
Item Number: GWR-RS-SSTT-ND
Manufacturer: Good-Win-Racing
Manufacturer Part No: 61-1934

Good-win Racing Logo RoadsterSport
SuperStreet TwinTip Muffler

2016+ MX-5 Miata

This is a modified version of the all Helmholtz Super Street muffler that adds small chamber dual tip muffler to add lots more user control, over FIVE different sound settings with the included MIXING BAFFLE, over TEN different sound level and tone variations if you mix in the optional packed baffles available on this site. 

Nonetheless, this is a VERY aggressive muffler by design with roots in the RACE muffler, with the included mixing baffle fully inserted to bypass the final chamber this muffler becomes precisely the same layout and sound as the RACE muffler. Progressively back out the included Mixing Baffle to lower the frequency balance of the result and overall DB level.
RoadsterSport Street Single TwinTip for ND

Goodwin Racing now includes a Mixing baffle that effectively converts this muffler to same sound as the Race muffler, adding back in the higher frequencies the chamber would otherwise convert lower (to cover the costs of adding that blocking baffle we are ending the RoadsterSport script on the tips). Result is more choice and control over the result than any other choice.

Separately on the site is a blocked baffle that effectively converts this unit to same frequency balance as the SuperStreet Single Tip. Thus, now essentially THREE mufflers in one here, the Race with included Mixing baffle, the SuperStreet Single tip if you add long blocked baffle or skip the long baffles and use standard length baffles in one or both tips to keep the bass heavy frequency balance but lower the volume. Result is a 17 pound street muffler with MORE flexibility than all other choices.

You get the great look of the RoadsterSport rolled and polished twin tips, the clean flow of the shortest possible path from the midpipe to the exhaust tips to max your horsepower gains, unprecedented level of user adjustment...and minimal weight with these features.

What the baffles add is much more ability to tune the frequency balance of that result. Left rear tip pathway is essentially a straight through and adding Mixing Baffle or long baffles to driver's side tip cuts off the chamber and massively lowers the bass notes and raises the upper frequency response, etc.


Ships factory direct to you. All POLISHED stainless steel construction. Uses stock hangers and connects to either our RoadsterSport midpipe or the stock midpipe.

Proudly made in the USA with a LIFETIME WARRANY!  Emissions legal in CA and every other State of the Union.

Just one bolt under each tip to make the baffle easy change. Sold separate are standard length optional packed baffles that cut the sound a little more if you want and long packed baffle that bypasses muffler chamber like the included long blocking baffle but with packing to reduce volume and simulate the frequency balance of Single Tip SuperStreet).


We have report this does NOT clear the Hard Dog hidden hitch or a Velox rear diffusser!

RoadsterSport Street Single TwinTip for ND


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 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. 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, I suggest starting with baffles removed). 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.


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