ISR Circuit Spec Exhaust
Precision-built for 1994–2025 Mazda MX-5 / Miata (available in NA, NB, NC & ND fitments), the ISR Circuit Spec Exhaust delivers race-inspired sound, performance, and durability.

• Tailored fitment per generation — choose your correct model range: 1994-1997 NA, 1999-2005 NB, 2006-2014 NC, or 2016-2025 ND

• Two-piece stainless design for strength and modularity

• Brushed 2.5 in piping + polished muffler section

• All necessary hardware is included.

• Delivers a deep, aggressive tone with minimal weight penalty.

• Competition-only legality — intended for track or race vehicles, not street use (check your local laws)

Whether you’re building a daily driver with attitude or a dedicated track car, the ISR Circuit Spec exhaust brings the attitude and function you expect for your MX-5 / Miata.

*For the NB version of this exhaust - You'll be invoices for state sales tax. 

FAQ

Will I need a tune with this exhaust?
Not required — a cat-back alone doesn't change anything the ECU needs to compensate for. But combined with intake and header mods, a tune unlocks the package — grab the N1 tune for your chassis: VersaTuner N1 Tune for the NC MX-5 / VersaTuner N1 Tune for the ND MX-5.