Cobra Sport MZ21 Race Rear Axle-Back Performance Exhaust
Cobra Sport race-type rear axle-back performance exhaust for Mazda MX-5 Mk4 / ND 1.5 and 2.0 models from 2015 onwards, including GPF-equipped models applications listed in the compatibility table.
The MZ21 is a direct rear-section upgrade for the MX-5 ND, replacing the original rear silencer while retaining the factory centre section. It is an ideal option for customers looking for a stronger exhaust note and a more distinctive rear appearance without replacing the complete cat-back system.
Manufactured in the UK from certified grade 304 stainless steel, the MZ21 uses 2.5" / 63.5 mm pipework and TIG-welded construction. The race-type rear silencer is designed to provide a more pronounced exhaust character while retaining straightforward axle-back installation.
- Product type: Race rear axle-back performance exhaust
- Brand: Cobra Sport
- Base Cobra Sport product code: MZ21
- Vehicle application: Mazda MX-5 Mk4 / ND 1.5 & 2.0
- Model years: 2015 onwards
- GPF compatibility: Yes
- Exhaust section: Centre section rearwards
- Replaces: Original rear silencer / rear exhaust section
- Pipe diameter: 2.5" / 63.5 mm
- Material: Certified grade 304 stainless steel
- Construction: TIG welded
- Configuration: Race-type rear axle-back
- Manufacture: United Kingdom
Tailpipe options:
- YTP03 – MZ21YTP03: Cobra Sport YTP03 tailpipe configuration.
- YTP16 – MZ21YTP16: Cobra Sport YTP16 tailpipe configuration.
- TP102-CF – MZ21TP102-CF: Twin 3" / 76.2 mm carbon-fibre inward-rolled, slash-cut and staggered tailpipe with stainless-steel inner sleeve and 2.5" / 63.5 mm inlet.
Sound: Cobra Sport's published test results record 68.7 dB at idle and 93.1 dB at 4,000 rpm on a 1.5 RF model. On a 2.0 GPF-equipped model, Cobra Sport records 65.7 dB at idle and 83.3 dB at 4,000 rpm.
Fitment advice: The MZ21 replaces the original rear silencer and connects to the existing centre section. The exhaust should be loosely positioned before final tightening so the rear section sits naturally on its mounts and the selected tailpipe is correctly aligned within the bumper opening.
Other items to consider: Inspect the existing centre-to-rear exhaust connection and exhaust mounting rubbers during installation and replace worn components where necessary. The MZ21 can also be used in conjunction with the Cobra Sport MZ09 second de-cat front section. It is not compatible with Cobra Sport cat-back centre sections.
Useful tools / consumables: Vehicle lift or securely rated axle stands, socket and spanner set, penetrating fluid, exhaust-hanger removal tool or suitable pliers, torque wrench and suitable exhaust assembly compound where required.
Difficulty guide: Moderate. The MZ21 is a rear-section / axle-back replacement, making installation less involved than a complete cat-back system, although safe access beneath the vehicle and accurate tailpipe alignment are still required.
Why Cobra Sport? Cobra Sport performance exhausts are manufactured in the UK using certified grade 304 stainless steel and TIG-welded construction. The MZ21 provides a purpose-designed axle-back upgrade for the MX-5 ND, combining straightforward fitment with a more pronounced race-type exhaust character.
What's in the box: Cobra Sport MZ21 race rear axle-back exhaust with the selected tailpipe configuration, together with the relevant fittings and gaskets required for installation.
Installation / setup notes: The MZ21 fits from the standard centre section rearwards and retains the original centre exhaust. It is compatible with the Cobra Sport MZ09 second de-cat but is not compatible with Cobra Sport cat-back centre sections. Check clearances and tailpipe position before fully tightening the system.
Warranty: Cobra Sport offers a lifetime guarantee to the original purchaser on eligible car exhaust systems when registered online within 28 days of receipt, subject to its current terms and exclusions. Products not registered within this period are subject to Cobra Sport's one-year manufacturing warranty. Carbon-fibre tailpipe upgrades carry a one-year warranty.
| Make | Model | Sub Variant | Chassis / Code | Years | Power (PS) | Engine Codes | Fuel | Transmission | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Mazda | MX-5 Mk4 / ND | 1.5 | ND | 2015 onwards | Varies by model year | — | Petrol | Not restricted in Cobra Sport application data | Race rear axle-back; including GPF-equipped models |
| Mazda | MX-5 Mk4 / ND | 2.0 | ND | 2015 onwards | Varies by model year | — | Petrol | Not restricted in Cobra Sport application data | Race rear axle-back; including GPF-equipped models |
| Reference Type | Reference |
|---|---|
| Cobra Sport Base Product Code | MZ21 |
| Variant SKU – YTP03 | MZ21YTP03 |
| Variant SKU – YTP16 | MZ21YTP16 |
| Variant SKU – TP102-CF | MZ21TP102-CF |
| Product / System Type | Race Rear Axle-Back Performance Exhaust |
| Vehicle Application | Mazda MX-5 Mk4 / ND 1.5 & 2.0 – 2015 onwards |
| GPF Compatibility | Yes |
| Exhaust Section | Centre section rearwards / rear silencer replacement |
| Pipe Diameter | 2.5" / 63.5 mm |
| Tailpipe Options | YTP03 / YTP16 / TP102-CF Carbon Fibre |
| Compatible Cobra Sport Section | MZ09 second de-cat |