If you own a 2016-2018 Mazda Miata ND1 and you're building it for the track, the factory exhaust is the heaviest weight you can lose at the back of the car for the smallest amount of money. The ISR Performance RC Series Exhaust replaces it with a straight-through, muffler-less design that drops significant weight, opens up exhaust flow, and gives the car the aggressive note that track Miatas are supposed to have. This is not a refined cat-back upgrade for daily driving. It's a track-focused exhaust built for one job.
What It Is
The ISR Performance RC Series Exhaust is a straight-through, muffler-less rear exhaust section for the 2016-2018 ND1 Mazda Miata. It replaces the entire factory rear section with a 2.5-inch stainless steel mid pipe and a 2.75-inch to 3-inch muffler delete rear section, connected via a V-band clamp. This is the lightest exhaust setup ISR offers for the ND Miata platform, designed specifically for track and competition use.
What It Does
The factory ND Miata exhaust is engineered for refinement, which means heavy and restrictive. The RC Series replaces the entire rear section with a straight-through design that eliminates the muffler altogether. The result is significantly less weight at the back of the car (improving polar moment and corner balance), much better exhaust flow, and a more aggressive exhaust note that suits a stripped-down track car.
Since this is a track-focused, muffler-less design, you're not chasing daily-driver refinement or polite highway cruising. The performance benefit is weight reduction, flow improvement, and the kind of exhaust note that matches how the car drives at full throttle. Some buyers do install this on street-driven cars, but be aware of what you're signing up for in terms of cabin noise and highway drone.
Construction Quality
The RC Series is built from stainless steel throughout, with 2.5-inch mid pipe sections and a 2.75-inch to 3-inch transition at the rear muffler delete section. The mid pipe is a two-piece design, which makes installation easier in the limited workspace under the ND chassis and lets you remove just one section for servicing if needed. The two main sections connect via a V-band clamp, which is significantly stronger and easier to service than a traditional flanged bolt connection.
Stainless steel is the right material for a track exhaust. It handles heat cycling, resists corrosion, and won't rust out the way a coated steel exhaust eventually will. For a system that's going to live under a track-driven car, durability matters more than finish.
Fitment and Compatibility
This exhaust fits the 2016-2018 Mazda Miata ND1 with manual transmission. Verify your model year, generation, and transmission before purchasing.
Critical fitment notes:
- Manual transmission only. This exhaust is designed exclusively for manual transmission ND1 Miatas. It will not fit automatic variants.
- Untested on ND Club models. The Club trim uses a slightly different rear bumper cover, and ISR has not specifically tested the RC Series on that trim. Reports suggest the exhaust may interfere with the bumper cover on Club models. If you own a Club, verify clearance before installation or contact ISR directly to confirm fitment.
- Noise levels. This is a muffler-less, straight-through design. Sound levels will be significantly higher than a standard exhaust and may not meet track noise limits at some venues. Verify your local track's dB policy before installation.
Who This Is For
This exhaust fits a specific build profile. If you're running a track-focused or HPDE-prepped ND1 Miata, this is one of the easiest and cheapest weight reductions you can make. If you've already done bolt-on power upgrades or are running forced induction and need to free up the exhaust side, the straight-through design supports that flow. If you're prepping the car for Spec Miata, Time Attack, or any track-focused class where exhaust restrictions are open, this checks the boxes.
This is not the right exhaust if you're looking for a refined cat-back for daily driving, if you own an automatic ND, or if you need to meet strict noise limits at your home track without modification.
What's in the Box
- 1x RC muffler delete pipe
- 1x Mid pipe
- 1x V-band flange
- 1x 2.75-inch exhaust gasket
- 2x Bolts
- 2x Nuts
Installation Notes
Installation is a direct bolt-on replacement for the factory rear section. The vehicle needs to be lifted to access the underside, and the factory rear exhaust is unbolted and removed before the ISR sections are installed in its place. The V-band clamp connection between the two main sections makes alignment and final tightening straightforward. All necessary hardware and the exhaust gasket are included.
Professional installation is recommended if you don't have access to a lift, but the swap is well within reach for any home garage with jack stands and basic hand tools. If your factory exhaust hangers or bushings are worn from age, replace them while you've got the rear section off. Access is never easier than during this install.
Off-Road and Competition Use
This exhaust is legal only for use in competition vehicles which may never be registered, licensed, or used on public streets or highways, and for use in other exempted vehicles. It is not 50-state street legal. Verify local emissions and noise regulations before purchasing if you intend to drive the vehicle on public roads.
Product Details
Brand: ISR Performance
Product: RC Series Exhaust
Part Number: IS-RCE-ND
Vehicle Fitment: 2016-2018 Mazda Miata ND1 (manual transmission only)
Transmission Compatibility: Manual only (NOT compatible with automatic)
Trim Compatibility: NOT tested on Club models (may interfere with bumper cover)
Type: Straight-through, muffler-less exhaust
Material: Stainless steel
Mid Pipe: 2.5-inch stainless steel, two-piece design
Rear Section: 2.75-inch to 3-inch muffler delete
Connection: V-band clamp
Application: Track and competition use
Legality: Off-road and competition use only, not 50-state street legal
Key Benefits: Significant weight reduction at the rear, unrestricted exhaust flow, aggressive track-appropriate exhaust note, stainless steel durability