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Used exhaust systems vary between vehicles - and whether you call it used, second hand or a replacement, matching the right one matters. These are the details breakers need to match the right part to your car - our request form asks them so you only hear from suppliers with the correct part:
The Mazda 323 ran through several distinct generations in the UK, with the final generation (BJ) covering roughly 1998 to 2003 — this is the most commonly available one at breakers. Each generation used different platforms and engine families, so exhaust systems are generally not interchangeable between them. Always match the part to your specific generation and engine code rather than just the 323 name.
The 1998 to 2003 BJ-generation 323 shares the same basic platform, so there is a reasonable chance of compatibility within that run — but the critical thing to match is the engine code, since the BJ was offered with different petrol engines that used different exhaust configurations. A system from the same engine code within the BJ range is your best starting point, but confirm the exact part against your registration with the breaker before buying.
Trim level alone does not determine exhaust fitment on the Mazda 323; what matters is the engine code and fuel type fitted to that trim. An LX and a GSi sharing the same engine will use the same exhaust system, though there may be minor cosmetic differences such as tip finish depending on specification. Tell the breaker your engine code and fuel type rather than your trim name, and confirm against your registration.
No — petrol and diesel engines use entirely different exhaust systems, and a petrol system will not fit a diesel application. The Mazda 323 BJ was predominantly sold with petrol engines in the UK, so if you have a diesel variant it is important to be specific with the breaker about your fuel type and engine code. Never assume a system will cross between fuel types even if the cars look identical.
Catalytic converter compatibility and MOT legality depend on emissions certification specific to your vehicle's registration, not just the model year or engine code alone. This is strong confirm-with-breaker territory — you should provide your registration and engine code to the breaker and ask them to verify the cat specification matches your car's emissions requirements. Do not assume a cat from even a closely related 323 will satisfy your MOT examiner without that check.
The exhaust system runs under the car and is determined by engine code and emissions specification, not by the number of doors or body style. A system from a 3-door and a 5-door 323 with the same engine code should be equivalent for fitment purposes. Focus your search on matching the engine code and fuel type, and confirm the specific part number with the breaker against your registration.