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Simple Bolt on for MANUAL TRANSMISSION ONLY, can be installed on Automatic but see our forum header install thread for details of what is required (cooling line re-route and modification of heat shield panel near midpipe install).
Includes our Made In America All Stainless Steel Lifetime Warranty
*Roadstersport STREET Header
*New RoadsterSport HELMHOLTZ Midpipe
See Extensive additional information in the product listings for each of these items elsewhere on our MX5 exhaust page, including dyno and video links, just short summaries below.
RoadsterSport STREET Header! The most torque you can buy in a catted MX5 Miata header! See our forum MX5 PRHT Project and Dyno thread for many more details on development history, pictures of prototypes, and dyno work. A great choice for street customers looking for an MX5 Miata header with converter that is 49 state legal!
MX5 Miata Street Header features:
-Longer, equal length runners
-High-flow 5" round, 200cpi Ceramic Core Catalytic Converter
-49 state legal cat (EPA and OBD2 compliant, but NOT CARB APPROVED for California, the Carsound 99659HM core is an EPA certified converter covering up-to 6.2L/6375 lbs so it easily handles the flow of our performance header while still delivering clean tailpipe emissions)
-Bolt-in design for MANUAL TRANSMISSION
Also saves weight, factory header assembly is 15.2 pounds and this RoadsterSport MX5 Street Header with converter is just 11 pounds! Converter has two year warranty (normally aspirated cars only, not for a supercharged Miata!), the rest is all stainless steel and has a LIFETIME warranty, even the flanges!
Currently for Manual Transmission only (a professional can install on the automatic but it requires re-engineering the cooling line layout and modification to the bell housing). Also, sorry to our Australian customers but this fits Left Hand Drive only!
We have included a number of extra features into our MX5 Miata Street Header which we believe customers will appreciate. We CNC machine the main flange to match the factory unit, including the bolt hole flange area thicknesses so that we are precisely replicating the factory fit to the head in terms of thread depth and space, etc. INSTALL NOTE: We have not included the O2 extension cords because we find it pretty easy to release the O2 wires from the factory bracket to which they are attached (follow the O2 wires until you reach that bracket).
RoadsterSport Stainless Steel HELMHOLTZ Midpipe. Ultimate "BOOMINESS" prevention, the Helmholtz chamber is a revolution in Miata exhaust system design, computer designed to cut the 'boomy' drone frequencies we don't want reaching the muffler by 48 decibels. The result is the fun burble, not the decel drone of other brand systems! All stainless steel construction for years of driving pleasure. This MX5 Miata midpipe is slightly larger diameter than stock at 2.5 inches all the way through. Uses high quality SPUN catalytic converter with metal core (despite presence of converter this unit is not CARB approved). Sorry, cannot ship to residents of California. Stock midpipe is 20 pounds, our midpipe is 16.5 pounds for total savings of 3.5 pounds.
The header and midpipe are legal for offroad race use only in California, and not CARB approved at this time.
RoadsterSport "Super-Q" Stainless Steel Premium Adjustable Sound MX5 Miata Exhaust. Our Best! We make FIVE very different Miata exhaust choices for the 2006 and newer MX5 Miata, including the RoadsterSport RACE, RoadsterSport STREET Single, the RoadsterSport II Duals, the RoadsterSport Q, this super premium duals unit we affectionately call the RoadsterSport Super-Q. This attenuation chamber design unit is the most mild and mellow on an otherwise stock Miata...about 10 to 15% louder than stock...with a deep burble. This unit was designed for both improved flow performance AND the best sound absorbing ability possible. This premium MX5 muffler is the BEST choice for those who plan such additional mods as a supercharger or header change (which unleashes a massive amount of additional sound). By using smooth mandrel bent 2.5 inch tubing to redirect the flow for a side entrance to the muffler we engineered a sound wave attenuation first chamber to knock down volume level dramatically while maintaining a flow-through design. Our latest and best dyno results for the header change which are in our forum were obtained with this muffler....ALL THE FLOW, without the noise! Yes, simple BOLT ON that bolts to our midpipe, or the factory midpipe, or our Racing Beat midpipes. Weight is 24 pounds.
PICTURE OF FACTORY MX5 HEADER BELOW, Note the pinch point where the factory header suffers the primaries pinched in half, circled in red below. That pinch point chokes the power this Miata 2.0 motor can otherwise make. Our Roadstersport Street MX5 Header eliminates that pinch point, extends the primary length to max torque gains, while retaining a high efficiency converter.
BRIAN'S APPLICATION NOTES: See in picture of our catted header below that we pushed the converter as far down against the lower flange as possible to maximize the length of our primaries to maximize the torque gains. Dyno Below shows results of configuration we expect most will run (RoadsterSport Street Header with Roadstersport Q midpipe and Roadstersport Super-Q muffler). Low line best results with stock intake and stock exhaust, high line is results with this Roadstersport Street Header, Roadstersport Midpipe and Roadstersport Super-Q exhaust. No tune done for any of these results, adding our MotoEast tune would add even more.
Notice O2 Bung BEFORE and AFTER Converter so you can keep your factory O2 Sensors inline and prevent engine codes.
Notice in dyno that the gains in torque are strongest at the low rpm range but extend through the mid range and all the way to redline, that's a torque improvement you can feel every time you pull away from a stop and every time you grab a higher gear!
Read full header and exhaust installation hints, and see PICTURES, and notes in our forum Installation Instruction Section! The first secret is 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).
A little on the science, we targeted 120-130 hertz range which is where most folks report uncomfortable 'drone' or 'boominess' and got a total of 48 decibel max drop right at the 125 hertz level...which is a MASSIVE reduction. Nonetheless, looking at broader range we get an average 20 decibel drop from 115 to 138 hertz with reasonable 8 decibel drop in the ranges of 95 to 115 and 138 to 180 hertz.
Shot on our Project 2012 with our RoadsterSport Street Header, RoadsterSport Helmholtz Midpipe, RoadsterSport SuperQ Exhaust. In this first sample notice what you do NOT hear, I get on it briefly and then engine brake almost down to a stop and during that engine braking the system gets more and more quiet where normal systems would drone as you engine brake down through 3000 rpms to 2000 rpms.
Second Video Sample: Shot from the bumper this clip massively exaggerates the volume but notice again what you don't hear, lots or racy sound when on throttle but every time I close throttle it quickly gets quiet instead of drone like many systems.
And finally, a more complete driving video with the camera inside the car: