Miata MX5 RoadsterSport Exhausts

Pictures, Videos, and other MX5 Miata RoadsterSport Exhaust Info.

GENERAL BACKGROUND on MX5 Exhausts

MX5 Miata Exhausts for 2006-2012 MX5 Miatas add power and fun! Good-Win Racing makes and sells more exhaust choices for the MX5  Miata than any other company, and we use that experience to help YOU find the best MX5 exhaust choice. We provide an estimate of how much louder each exhaust choice is over stock sound levels in the product description for most of our MX5 Miata exhausts. We have MX5 Miata exhausts designed for street use, race use, as well as MX5 Miata exhausts designed to handle a performance header or MX5 Miata supercharger.

One VERY important factor to consider is how factory options change the listening environment of the MX5 driver. The driver of a manual transmission soft top equipped MX5 Miata has a VERY different vehicle in terms of sound dynamics than does the owner of an automatic transmission equipped folding hardtop MX5 Miata.   The hardtop is an echo chamber in comparison to the soft top Miata.  Thus, street drivers of otherwise stock manual transmission soft top equipped MX5 Miatas tend to prefer louder exhausts choices such as our best selling RoadsterSport II or our Racing Beat dual tipped exhaust. However, owners of automatic equipped MX5 Miatas, and any MX5 owner with a folding hardtop, usually prefer the RoadsterSport Q Dual exhaust. All owners considering further modifications such as our performance headers, performance midpipes, and superchargers, are strongly encouraged to consider the RoadsterSport Q.

Finally, we offer BOTH a “Race Single” and “Street Single” that are designed for the sound limits of SCCA events and tracks such as Mazda Raceway Laguna Seca, though some will find them appropriate for their street use. If you have any questions about which MX5 exhaust is best for you, please contact us by email or phone today.

MX5 Race Single:

Here is a combo not for the faint of heart, the RoadsterSport RACE and RoadsterSport Header
[a href="http://www.youtube.com/watch?v=bg5wY544-FY"]

ROADSTERSPORT STREET SINGLE…Watch entire video for Drive By!

ROADSTERSPORT II DUALS

FULL SYSTEM ROAD COMPARISON RoadsterSport Header, Midpipe, RoadsterSport Q Muffler:

DYNO WORK—CLICK HERE FOR GRAPH

On a dyno dynamics unit with our 2006 MX5 Miata we were stock 130 to 132 at the wheels across several runs (remember that the factory claim of 170 is “crank” horsepower for 2006 and 166 crank hp for 2007 under the new testing procedures). These results are identical to what AEM and Grassroots MotorSports got for stock on their project cars. With the AEM intake and RoadsterSport II exhaust we hit peaks of 145-148 depending on the run…again on a Dyno Dynamics unit. Figure about half that for the AEM intake (which is in line with their claims and dyno charts) and half the exhaust.

Note that the The Dyno Dynamics dyno is an eddy-current dyno, it is not an inertia dyno. Without getting into that debate about what is a “real dyno”, just understand that when you see stock numbers of 145 to 150 then it is likely it was from an inertia dyno (Magnaflow NC exhaust advertised results for example). Conversion between these types of dynos is rough at best….and it is much preferred to compare apples with apples by doing all before and after tests on the SAME DYNO.

Now to the dynos comparing mods. THREE levels of mods below.

LOWEST line is our best NC dyno run with AEM intake and our RoadsterSport Q, a nice gain of about 14-16 horsepower over stock NC.

MIDDLE run adds the midpipe change. This midpipe change was VERY interesting. Did several runs and they all look like this with a very slight loss of 2 peak horsepower but a gain of 5 to 8 Ft/lbs of torque from 3500 all the way past 6000 rpms.

HIGHEST RUN adds in our RoadsterSport header. NICE 158.9 hp and 137 Ft/Lbs!! This is Header with our midpipe and exhaust and the AEM intake. Note that the RoadsterSport header does NOT have hookups for O2 sensors, but we sell the extension cords to make this install plug and play. The RoadsterSport midpipe includes TWO O2 sensor bungs, one before and after the catalytic converter to make it easy to relocate the sensors with the optional extension cables to avoid codes. Our RoadsterSport Midpipe uses a massive 18 inch long resonator to keep sound the same despite the gain in flow over the stock unit… but adding header will add a lot of sound. If you like old Italian Fiats and Alfas then you will love the sound of this car with the header, and those with more delicate sensibilities should consider our headers that include a converter in the header itself. Note the interesting comparison with the Grassroots MotorSports project NC Spec Miata; we started with the exact same baseline results and finished almost the same, 2 hp and 2 ft/lbs stronger, all the gains of the full race system without the full race system noise.

For MORE on they dyno work, including MANY pages of forum discussion followup, please see the FORUM DISCUSSION.

UPDATES 2012:  Our header options have expanded significantly and in addition to our RoadsterSport and Racing Beat headers we now have our PPE headers, one PPE MX5 Miata Header with converter and one PPE Long Tube header for max torque.  See our forum discussions regarding the Long Tube PPE header and on our project 2012 MX5 for details on our prototype RoadsterSport Street header with converter.