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RoadsterSport II Stainless Steel Muffler for 06-15 MX5

Price: From $399.00 to $429.00
Manufacturer: Good-Win-Racing

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Model and option package:
Good-win Racing Logo RoadsterSport II
Stainless Steel Muffler

2006-2015 MX5

The original 'bad boy' duals for the 2006 and newer MX5 Miata was a best selling Miata exhaust before the RoadsterSport Q took the sales crown. This revised version II choice remains popular as a LOUDER duals choice, great for soft top owners who like to wind out their manual transmissions to redline. We suggest those adding headers or using automatics or the PRHT (Power Retracking Hard Top) look to the RoadsterSport Q.

RoadsterSport 2 for NC
Messing with the successful design to improve it was approached cautiously. Goodwin Racing learned on the dyno in testing for this header that it had ideal flow into the muffler and through the core but that the 2.25 inch connections between muffler and the tips was actually too much, and that cutting to 2 inches from muffler to tip was ideal for maintaining exhaust gas velocity and maximizing horsepower gain. The connection into this muffler remains 2.5 inches for maximum flow and horsepower.

Other improvements in this version II include reinforced hangers and more sound insulation for an even more mild sound. Built in solid 304 stainless steel and completely polished to a mirror finish, the RoadsterSport exhausts are the only choice that incorporate baffle inserts that give YOU control over the final sound level.

RoadsterSport 3 for NC Installed

This Miata exhaust is a simple installation and includes everything you need (gasket too). Already a legend, the RoadsterSport II Duals Mazda MX-5 Miata exhaust is always in stock and shipping daily.

This RoadsterSport 2 delivers the zoom-zoom that the factory exhaust does not. This Miata exhaust has an aggressive deep purr when you step on it. The factory exhaust on the 2006-2013 MX-5 Mazda Miata is one of the few places that Mazda wasted a good amount of weight. The thick mild steel stock Miata muffler canister on the 2006-2014 MX5 Miata saves Mazda a lot of money but it alone is over 27 pounds!

This all stainless steel Miata exhaust uses the factory spacing, factory cutouts, and factory layout but saves 5 pounds of weight and adds more of a classic sports car sound. Note that the Magneflow system is 45 pounds, which is why Goodwin Racing worked hard to take weight off by using higher density packing and higher perforation rate cores to bring the weight below stock level.

RoadsterSport 2 Rolled Tips
INCLUDES exclusive baffle cone inserts which are REMOVABLE and allow you to set the sound to sporty...or extra sporty. Also available are optional packed baffles with which you can quiet it down even more for longer trips.

With the baffle out the sound on this version II is about 25% more than stock. With the baffle in the sound is closer to 20% over stock. Baffles are retained by small hex bolts inserted from well under each tip.

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. Proudly made in the USA with a LIFETIME WARRANTY. Fits all 2006 and newer with manual transmission MX5 Miata, automatic transmission MX5 Miata, and retractable hardtop MX5 Miata!

JUNE 2013 Update:

New Rolled Tip Design! There were 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.

This exhaust still works with, and includes, unique removeable baffles that put YOU in control over final sound levels. NOTE BREAK-IN of a few hundred miles before it settles to final sound level (during that time the interior metal is getting coated with carbon, which mellows the sound). 


We have a full range of exhaust choices for the new 3rd generation MX5 Miata. All of them give you better flow for more horespower, some of them save weight over the massive 26 pound stock unit.

Since one man's too loud is another man's too quiet, here is how each of our Miata exhaust choices ranks in terms of sound level: the Racing Beat is about 15% louder than stock and very deep sounding,the RoadsterSport II Duals is actually adjustable for a range from 15 to 25% more sound than stock depending on whether or not you use the included baffles or the optional packed silencer baffles. The RoadsterSport RACE single tip Miata exhaust is about 50% more sound than stock.

Please trust us when we tell you here that you do NOT want the appearance package version UNLESS you actually have an appearance package car because tips would look silly on car that does not have appearance package.

For the MX5 Miata FACTORY Appearance Package it is the SAME RoadsterSport II EXHAUST EXCEPT tips are extended 2 inches. Please be careful and notice the seam running across the lower middle of the bumper. If your MX5 has that seam, then you have the appearance package. If you do not see that seam, you do NOT have the appearance package. Too many good folks think that because they own a Grand Touring with 'everything' that they must have the appearance package....but usually they do not. ALSO, if you want your muffler tips to look as recessed/submerged as those factory tips, then order just the regular version, not this extended length version which will bring the tips out just past the edge of the plastic cutouts.

RoadsterSport 2 Rolled Tip

This was our best seller for the manual transmission MX5 until the "Q" came along. We prefer the RoadsterSport Q for those with the automatic transmission or anybody considering purchase of a header...or anybody who wants it nice and mild. The demographics on this choice are interesting, as it is most popular with our buyers Under 30 years of age....and over 60. My best guess on that fact is the younger guys tend to run the car in the upper RPMS more where this exhaust has its best note, and the customers over 60 tend to do the same because so many of them came from a history of British sports cars where life began over 4000 rpms. Either way, if YOU are the type that rarely ventures over 4000 rpms then I strongly suggest the Roadstersport Q instead.


The secret is to LUBE your hangers well with dish soap 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).

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