This is a modified version of the helmholtz Super Street muffler that adds small chamber dual tip muffler to add lots more user control, four 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 our RACE muffler, with the included mixing baffle fully inserted left (Driver's) side 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.

UPDATE May 2017, we now include a Mixing baffle that effectively converts this muffler to same sound as the Race muffler when fully inserted driver's side tip, 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 and deleting the less effective pair of cone baffles). Result is more effective control over tone and the balance of treble vs bass than any other choice, max upper frequency fun is mixing baffle fully inserted driver's side tip, back it out to the other positions to progressively shift frequency balance lower.

Separately on the site is a fiber packed long 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 packed long baffle (item 60-1325SSTT), or skip the long baffles and use standard length baffles in one or both tips (item 60-1324T) 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.

Driver's side tip pathway is essentially a straight through and adding Mixing Baffle to driver's side tip progressively cuts off the chamber and massively lowers the bass notes and raises the upper frequency response, etc.

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

Just one bolt under each tip to make the baffle easy change.

Proudly made in the USA...with a LIFETIME WARRANTY, emissions legal in all 50 states!

NOTE we have report this does NOT clear our harddog hidden hitch or Velox rear diffusser!

BRIAN'S APPLICATION NOTES: Mild when cruising on otherwise stock ND, delivering a classic sports car BARK and THROATY RUMBLE when you wind it out to redline, lots of fun burble when just playing with the throttle around town. Easily UNDER our local SCCA sound limits on otherwise stock Miata (our SCCA limit here is 93 db at 50 feet and even in the rain our testing found it easily under our strictly enforced sound limits). Also easily under the most strict 92db days at Mazda Raceway Laguna Seca when used on otherwise stock ND. Result is TONS of fun, will make many of you laugh out loud. You also get the best performance from the straightest and cleanest flow out the exhaust cutout you can get, and much lower weight. Nonetheless, this choice is NOT for the faint of heart!!! The most common question we will get on this one is: "will it be too loud" and we cannot answer that one for you because the "right" sound level is a matter of entirely subjective personal preference.

Not designed for use on car with aftermarket header or aftermarket midpipe, designed for max fun on otherwise stock exhaust system. Adding header adds a massive amount of sound, thus we suggest customers considering adding a header should look to our SuperQ choices for best control of results with header change. The issue with using adjustable length midpipe with this ultra light three hanger design is that customers rarely get the adjustable length set correct and that can put too much stress on the connection between helmholtz chamber and straight pipe. So if you insist on adding midpipe with this design be careful to get length of midpipe accurate (hangers aligned nicely straight up and down for midpipe) and use thicker hanger from the rear to better support the bigger midpipe.

NOTICE: Large items do not typically ship internationally. If you order this from outside the US we will quote you for international shipping!