Ref Sensor · Miata sourcing
Exhaust (ND)
The ND's exhaust choices are mostly mufflers and cat-backs, plus Flyin' Miata's switchable system. This page lists what two sellers describe. It is not a repair guide, and emissions and noise rules differ by state.
How to read it. Every claim is the seller's, as read on its own page on 1 October 2026. There are no prices on this page, and nothing here was bought or tested. I found no owner thread I read on this topic, so it is seller descriptions only.
| Seller | What it says it offers | Fits (as stated) |
|---|---|---|
| Flyin' Miata, Hush-O-Matic | an active exhaust with a butterfly valve that routes gas through different muffler paths with throttle: quiet at idle and light throttle, opening a less muffled path when you press deeper, but never completely bypassing the muffler. It replaces the factory system and the page says "emissions do not apply". Lifetime warranty on mechanical parts for the original owner. A slight vibration noise can occur as the valve closes at small throttle openings; a separate CAN control module can hold it open or closed | ND, 2016-2026, and the 2017-2026 RF; works with automatics and a Hard Dog Hideaway hitch |
| Moss Miata, ND exhaust list | its list shows: Borla, Cobalt, Racing Beat (Power Pulse and Sport/Race), RoadsterSport (Super Street and Race mufflers, and a mid-pipe for manual cars) and Jass exhaust tips; ISR, HKS Legamax and Magnaflow exhaust systems (Magnaflow 2016-2023); and a Mazda sound-tube delete kit and muffler gasket | ND, 2016-2025 unless the page says otherwise |
Not covered yet
- Owner experience with ND exhausts, and the NC exhaust.
- Sound levels and legality for specific systems; check your state's rules.
© 2026 Fischer Interactive LLC. Written for the Ref Sensor app's Miata users. The seller's page is the authority.