RoadsterSport Stainless MX-5 Miata Midpipe 2006-2015
*Manual Transmission ONLY
Designed to work with our RoadsterSport Duals or RoadsterSport.
Race muffler as a simple bolt on (but will also bolt up to our Racing Beat exhaust, MazdaSpeed exhausts, etc.).
Our midpipe gains 5 to 8 Ft/Lbs of torque from 3500 rpms through 6000 rpms. All stainless steel construction for years of driving pleasure.
This MX-5 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). Uses monster 18 inch resonator because when you uncork this NC MX-5 Miata motor it wants to get loud unless you use a resonator this large (by comparison stock resonator is about a foot long).
Stock midpipe is 20 pounds, our midpipe is 16.5 pounds for total savings of 3.5 pounds. Despite very large resonator, this midpipe will raise the final sound level just sightly because of the higher flow larger diameter tubing.
GO MIATA APPLICATION NOTES: We started with the much larger "two biscuit" cat we use in the 99-05 midpipe system but I didn't like the sound quality that resulted. This small single biscuit spun unit is actually more expensive than the big metal clamshell cat we use in the 1999-2005 system but we did some experimenting with cats of different sizes and the short chambered spun cat helps reduce that 3000 rpm DRONE/ BOOM that this motor really wants to make on decel when uncorked.
The short cat also saves another 1.5 pounds as compared with the bigger cat.
As for sound level...with the big cat the sound volume level was really unchanged as compared with the stock midpipe but we made the tradeoff decision to reduce decel drone but finish with slightly higher overall volume using the short chambered spun cat. I think most will appreciate this choice.