Browse Categories

RoadsterSport "Q" Stainless Steel Muffler for 06-15 MX5

Price: From $469.00 to $489.00
Manufacturer: Good-Win-Racing

Product Options

Model and option package:

Good-win Racing Logo RoadsterSport "Q"
Stainless Steel Muffler

2006-2015 MX5 

This is a very popular Miata Exhaust! Good-win Racing is so confident this is the best MX5 Miata exhaust that they let you drive it for 90 days and if at the end of 90 days you don't love it, you can send it back in original package for exchange to any of their other choices!

Promised for years and they finally got it done, a revised version of the famous RoadsterSport Q that is even more successful at controlling sound for customers making modifications such as high-flow headers and superchargers. This is also a great recommendation for customers with automatic transmissions, and or customers with the PRHT hardtop, or any customer wanting something deep and throaty when they put their foot in it but not shouting at them when they are just in cruise mode.
RoadsterSport Q for NC
RoadsterSport Q for NC installed
This attenuation design is a premium "NO-DRONE" choice, great for those with manual transmission and especially for those with the AUTOMATIC transmission (which tends to keep the RPMS in the lower ranges). By using smooth mandrel bent 2.5 inch tubing to redirect the flow for a side entrance to the muffler Good-win Racing engineered a sound wave attenuation first chamber to knock down volume level dramatically while maintaining a flow-through design. This attenuation chamber design muffler is the most mild and mellow on an otherwise stock MX5 Miata...about 10 to 15% louder than stock...with a deep sporty burble anytime you hit the go pedal but quiet when you are just cruising.

This premium MX5 muffler is also an excellent choice for those who plan such additional mods as a supercharger or header change (a header change unleashes a massive amount of additional sound). Good-win Racing's latest and best dyno results for an otherwise stock Miata....and for modified Miatas with the header change all the way to supercharged were obtained with the RoadsterSport Q muffler. ALL THE FLOW, without the noise!

Simple BOLT ON installation that connects to the RoadsterSport midpipe, the factory midpipe or the Racing Beat midpipes. INCLUDES New gasket and hardware to make your install super easy. Weight is 24.5 pounds with baffles removed, 26.5 pounds with baffles installed (stock muffler is over 27 pounds).

Finished in tips which INCLUDE an exclusive baffle cone inserts which are REMOVEABLE and allow you to set the sound to sporty...or quiet. Also available are optional packed baffles with which you can quiet it down even more for those using a header or supercharger, or race midpipe, etc. This system is 10% to 15% louder than the stock Miata muffler on an otherwise stock MX5 Miata exhaust system....and only 25% over stock sound level when used with our complete 2.5 inch RoadsterSport header and 2.5 inch RoadsterSport midpipe. Baffles are retained by small hex bolts inserted from well under each tip.

RoadsterSport Q for NC from behind

Proudly made in the USA with a LIFETIME WARRANTY, emissions legal in all 50 states! Fits all 2006 and newer Miatas with manual or automatic transmission, soft top or retractable hardtop.

Installation of this Miata exhaust is SUPER EASY...just two bolts! You don't even need to jack up the car, this installation can be done in your driveway!  This Miata exhaust is guaranteed for as long as you own your Miata.
Pictures above of new ROLLED TIP APPEARANCE PACKAGE VERSION on TRUE RED MX5 with APPEARANCE PACKAGE (notice dividing line between upper red section of bumper and lower RED section of added appearance package). Nice flush fit for cars with appearance package!

BELOW is another version of the factory appearance package, 2013 Club with Roadstersport Q Appearance Package version in the left picture and before shots showing factory muffler in the right picture. On this version of rear bumper pick the regular Q muffler if you want the tips to stay nearer to stock location OR pick appearance package Q for result you see at left.
RoadsterSport Q for NC tip MAZDA NC Exhaust Tip


Everything we have learned about MX5 Miata exhausts, all our best tricks, have gone into this RoadsterSport Super Q. It is the perfect FIRST MODIFICATION and still the best choice for anyone planning future upgrades such as a header change or supercharger. It is quiet when you cruise down the freeway but delivers a sporty deep burble when you push your foot harder on the gas. This Miata Exhaust is the choice on my own soft top MX5 for driving around town...and my wife's PRHT MX5, and my strong recommendation for anybody wanting an exhaust with a super smooth burble, or any owner planning additional exhaust changes (header change or supercharger). This is also our top recommendation for owners of the automatic transmission and Power Retracting Hardtop.
RoadsterSport Q for NC Dyno
Even more impressive than the peak horsepower gains is the broad torque gain from low to middle rpms, as shown in the dyno report from Good-win Racing's 2012 project PRHT.
RoadsterSport Rolled Tips RoadsterSport Rolled Tips Detail

MAY 2012 Update: New Rolled Tip Design! Good-win Racing had many requests for a new thicker rolled tip. These new dual 3.5" OD outlet tips complete the look of the exhaust and provide a more aggressive and sporting appearance. Yes, still works with, and includes, their unique removeable baffles that put YOU in control over final sound levels. 

White 2013 (below and right) shows how standard length version fits another version of factory lower rear valance (if you want the tips longer that what you see here, then look at our version for Appearance Package).
RoadsterSport Standard Tip for NC Detail
RoadsterSport Standard Tip for NC from side RoadsterSport Standard Tip for NC from rear


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). 


The Appearance Package version is only for the cars with Appearance package (see PICTURES at the top of this page) and includes tips that are 1.5 inches longer to properly fit the MX5 factory Appearance Package lower rear valance. Look at those pictures carefully, all too many people think they have 'all the options' on their Grand Touring MX5 but in reality they usually do NOT have the appearance package. On the earlier NC generation if you don't see that extra body seam across the lower rear bumper, you do NOT have the appearance package. The factory exhaust is over 2.5 inches submerged when appearance package is on the car. On the latest NC2 generation Miatas there is yet another rear lower valance design and on that version you can stay with regular version of the Q if you want the tips to stay about where they are stock, or you can use this Appearance Package version.

Related Products

Racing Beat Race Connecting Pipe for 06-15 MX5
Price: $215.00
Racing Beat Race Connecting Pipe for 06-15 MX5
The Racing Beat Race Connecting Pipe is intended to replace the stock mid-pipe on the MX-5, thereby eliminating the integrated secondary catalytic converter and presilencer unit. Expect an aggressive tone, with a definite increase in sound.
RoadsterSport MAX Exhaust Header for 06-15 MX5
Price: From $549.00 to $699.00
RoadsterSport MAX Exhaust Header for 06-15 MX5
SMOOTH all mandrel bent tubes are used here to keep flow as clean as possible. T304 polished stainless steel is formed into equal length primaries for max power...with a lifetime warranty!
RoadsterSport Stainless Steel MX5 Midpipe with High Flow Catalytic Converter And Resonator for 06-15 MX5
Price: $459.00
RoadsterSport Stainless Steel MX5 Midpipe with High Flow Catalytic Converter And Resonator for 06-15 MX5
Bolt-on replacement for the factory midpipe to carry the 2.5 inch outlet of the factory header, and the RoadsterSport and Racing Beat headers, all the way to any of our 2.5 inch inlet mufflers.
Baffle for RoadsterSport Muffler for the 1990+ Miata MX5
Price: $39.00
Baffle for RoadsterSport Muffler for the 1990+ Miata MX5
RoadsterSport MX5 Miata mufflers ship with removable baffles but for those that want to tame the sound even more we offer these glass packed baffles.

Product Reviews

(0 Ratings, 0 Reviews)

Events and News 

Track Dog Racing FAQ

Supercharger FAQ

Intercooler FAQ

Technical Articles

Supercharger Upgrade Checklist

Roll Bar FAQ

Dyno Runs

High Performance Radiators

Customer Testimonials