Second Hand BMW M8 Catalytic Converter

Yes, all BMW M8 variants are petrol-engined and are fitted with catalytic converters as part of their exhaust emissions system. The M8 uses a high-output 4.4-litre twin-turbocharged V8 (engine code S63), and like all modern petrol cars sold in the UK it requires cats to meet Euro 6 emissions standards. You will typically find multiple catalytic converters on this car given the V8 twin-exhaust configuration, so make sure you tell the breaker exactly which one you need.

The BMW M8 (F91/F92/F93 generation) launched in 2019 and all examples share the same S63 4.4-litre twin-turbo V8, so on paper the engine architecture is consistent across the range. However, catalytic converter interchange specifics are strong confirm-with-breaker territory — emissions calibration, sensor positions and pipe configurations can vary even within the same generation, so you should give the breaker your full registration to check the exact part against your car before purchasing.

Trim level does not fundamentally change the catalytic converter requirement, as both the standard M8 and M8 Competition use the same S63 V8 engine and the same basic exhaust architecture. That said, the Competition may have differences in exhaust tuning or system routing, so confirm the specific part number with the breaker against your registration rather than assuming a straight swap. Cosmetically there may be minor differences in fitment brackets or sensor positions that the breaker will need to verify.

The M8 Coupe (F92), Convertible (F91) and Gran Coupe (F93) all share the S63 V8 engine, so the fundamental emissions equipment is the same across body styles. However, exhaust routing can differ between body styles due to chassis differences, which may affect which specific cat or section is a direct swap. Always confirm with the breaker using your registration number to make sure the part from a donor car of a different body style will fit yours without modification.

The BMW M5 (F90) also uses the S63 4.4-litre twin-turbo V8, which is the same engine family as the M8, so there is a degree of shared componentry between the two models. However, catalytic converter and exhaust system interchange between different model lines is strong confirm-with-breaker territory — pipe lengths, mounting points and sensor positions can differ even when the engine is identical. Give the breaker both registrations and let them verify compatibility before you commit to buying.

Give the breaker your full UK registration number, which lets them confirm your exact engine code, build date and emissions specification. It is also worth telling them which cat you need if there are multiple on the car — for example front or rear, NS or OS — as the M8's V8 produces twin exhaust banks. The more information you provide upfront, the more accurately the breaker can match the part and avoid you buying something that will not fit or could cause an MOT failure.