MazSpec Original Rear Exhaust Silencer / Backbox Gasket – MO-NC0-6-001
Replacement rear exhaust silencer sealing gasket for Mazda MX-5 MK3.5 / NC2 and MK3.75 / NC3 1.8L and 2.0L petrol models (2009–2015), designed for the exhaust flange connection between the centre exhaust pipe and rear silencer / backbox.
This MazSpec Original exhaust gasket seals the joint where the centre exhaust pipe connects to the rear silencer, helping prevent exhaust gases escaping from the connection during engine operation.
The joint is secured by two nut-and-bolt fasteners, which hold the adjoining exhaust sections together and maintain compression against the sealing gasket.
Over time, exhaust sealing gaskets can deteriorate due to repeated heating and cooling cycles, vibration, moisture and corrosion around the exhaust flange. A damaged or compressed gasket may allow exhaust gases to escape, resulting in increased noise, blowing sounds or soot deposits around the connection.
This replacement gasket is suitable for routine exhaust repairs, rear silencer replacement, centre pipe removal and renewal of worn exhaust sealing components.
Product features and specifications:
- Product type: Rear exhaust sealing gasket
- Brand: MazSpec Original
- Product reference: MO-NC0-6-001
- Fitting position: Centre exhaust pipe to rear silencer / backbox
- Function: Seals the exhaust flange connection
- Connection type: Flanged exhaust joint secured by two nut-and-bolt fasteners
- Vehicle applications: Mazda MX-5 MK3.5 / NC2 and MK3.75 / NC3
- Engine applications: 1.8L MZR L8 and 2.0L MZR LF petrol
- Quantity required per vehicle: 1 gasket
- Quantity supplied: 1 gasket
- Exhaust fixing bolts and nuts: Sold separately
- Exhaust pipework and rear silencer: Sold separately
Why Is the Exhaust Gasket Important?
- Helps maintain a gas-tight seal between the centre exhaust pipe and rear silencer.
- Prevents unwanted exhaust leakage at the rear exhaust flange.
- Helps reduce blowing noises caused by a deteriorated joint seal.
- Provides a replacement sealing component during exhaust servicing.
- Allows the existing exhaust sections to be refitted following dismantling.
Common replacement reasons:
- Exhaust blowing from the centre-pipe-to-backbox connection.
- Visible soot deposits around the exhaust flange.
- Existing gasket compressed, split or deteriorated.
- Rear exhaust silencer removed or replaced.
- Centre exhaust pipe removed for servicing.
- Exhaust joint dismantled during repairs.
- Exhaust sealing hardware being renewed.
Replacement advice: Exhaust gaskets are designed to seal under compression. When an exhaust joint is dismantled, the existing gasket may no longer provide the same seal when reused. Replacing the gasket during rear silencer or centre pipe servicing helps ensure the connection is properly sealed during reassembly.
Fitment advice: Suitable for the centre exhaust pipe to rear silencer connection on compatible Mazda MX-5 NC2 and NC3 1.8L and 2.0L models. This gasket is not intended for the separate exhaust manifold-to-mid-pipe connection. Vehicles equipped with non-standard exhaust systems may require different sealing components.
Flange condition advice: Inspect both exhaust flange mating surfaces before fitting the replacement gasket. Significant corrosion, cracking, deformation or damage to the mating surfaces may prevent the new gasket from sealing correctly.
Other items to consider: When renewing the exhaust gasket, inspect the associated flange fixing bolts, nuts, rear exhaust silencer, centre exhaust pipe, rubber exhaust hangers and surrounding heat shields. MazSpec also supplies Genuine Mazda exhaust sealing components for compatible MX-5 NC models.
Useful tools / consumables: Socket and spanner set, penetrating oil, wire brush, suitable exhaust support equipment, gasket removal tools and calibrated torque wrench.
Difficulty guide: DIY Difficulty: Easy to Moderate. Replacing the gasket is straightforward once the rear exhaust flange is separated, although heavily corroded or seized fasteners may make dismantling more difficult.
Why MazSpec Original? MazSpec Original replacement components provide practical repair solutions for commonly serviced Mazda MX-5 assemblies. This rear exhaust gasket is intended for the original-style centre-pipe-to-rear-silencer connection on compatible NC2 and NC3 models.
What's in the box: 1 × MazSpec Original Rear Exhaust Silencer / Backbox Gasket, reference MO-NC0-6-001.
Installation / service notes: Allow the exhaust system to cool completely before beginning work. Safely support the vehicle and the exhaust sections. Apply penetrating oil to corroded flange fasteners before carefully separating the joint. Remove the old gasket and clean both mating surfaces without damaging the flanges. Position the replacement gasket correctly, align the centre pipe and rear silencer, and refit the fastening hardware. Tighten the flange evenly in accordance with the vehicle manufacturer's procedure. Once assembled, inspect the joint for exhaust leaks and confirm the exhaust system is securely supported.
| Make | Model | Sub Variant | Chassis / Code | Years | Power (PS) | Engine Codes | Fuel | Transmission | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Mazda | MX-5 MK3.5 / NC | NC2 1.8L | NC / NCEC | 2009–2012 | 126 | L8-VE | Petrol | 5-speed manual | Centre exhaust pipe to rear silencer gasket; 1 per vehicle |
| Mazda | MX-5 MK3.5 / NC | NC2 2.0L | NC / NCEC | 2009–2012 | 160 | LF-VE | Petrol | 5/6-speed manual; automatic where fitted | Centre exhaust pipe to rear silencer gasket; 1 per vehicle |
| Mazda | MX-5 MK3.75 / NC | NC3 1.8L | NC / NCEC | 2013–2015 | 126 | L8-VE | Petrol | 5-speed manual | Centre exhaust pipe to rear silencer gasket; 1 per vehicle |
| Mazda | MX-5 MK3.75 / NC | NC3 2.0L | 2013–2015 | 160 | LF-VE | Petrol | 5/6-speed manual; automatic where fitted | Centre exhaust pipe to rear silencer gasket; 1 per vehicle |
| Reference Type | Reference Number |
|---|---|
| MazSpec Original Product Reference | MO-NC0-6-001 |
| Related Genuine Mazda Exhaust Gasket | PE23-40-305 |
| Previous Genuine Mazda Reference | LF45-40-305 |