The ISR RC Series exhaust for the 2016-2018 ND1 is a muffler-less, straight-through system built for one job: taking weight out of a track car. A 2-piece, 2.5-inch stainless mid section feeds a 2.75-to-3-inch rear muffler-delete section, with a V-band connection at the joint.

Two fitment notes before you order: ISR lists this for manual-transmission cars only, and it has not been tested on ND Club models — ISR says it may interfere with the bumper cover on those cars. Expect a muffler-delete exhaust to be loud; that’s the point of this one.

• Fitment: 2016-2018 Mazda Miata (ND1), manual transmission only; not tested on ND Club models, possible bumper-cover interference (per ISR)
• Straight-through, muffler-less construction
• 2.5 in stainless mid section (2-piece); 2.75 in to 3 in rear muffler-delete section
• Includes: muffler delete pipe, mid pipe, V-band flange, 2.75 in exhaust gasket, bolts and nuts