Second Hand BMW 8 Series Exhaust Manifold

All modern BMW 8 Series engines (produced from 2018 onwards) are turbocharged, which means they use a turbocharger manifold — sometimes called an exhaust manifold or turbo manifold — rather than a naturally aspirated exhaust manifold in the traditional sense. The casting that collects exhaust gases from the cylinder head and routes them into the turbocharger is the part you are looking for, and breakers will typically list it as an exhaust manifold or turbo manifold. When searching or requesting quotes, specifying your engine code (for example M50B30 for the 840i, S58 for the M8) will help breakers identify the correct casting for your car.

The BMW 8 Series (G14 Convertible, G15 Coupé, G16 Gran Coupé) ran from 2018 with a facelift arriving in 2022, and while the overall engine families carried over, there can be subtle differences in manifold casting, sensor positions and heat shielding between pre- and post-facelift builds. Matching on engine code is the safest approach — if the code is identical, fitment is more likely, but you should confirm directly with the breaker against your exact registration before purchasing.

Trim level itself does not affect fitment, but in the 8 Series each trim name corresponds to a different engine (for example the 840i uses a six-cylinder petrol, the 840d a six-cylinder diesel, the M850i a V8 petrol, and the M8 the high-output S63 V8), so the engine behind the badge is what really determines which manifold you need. Always quote your engine code to the breaker rather than just the trim name, as manifolds are not interchangeable across these different units.

No — diesel and petrol engines have completely different cylinder head designs, exhaust port layouts and turbocharger configurations, so a 840d manifold will not fit a petrol engine. Make sure you specify both fuel type and engine code when requesting quotes from breakers, as a mismatched manifold simply will not bolt up correctly.

The BMW 8 Series was launched in 2018 already under Euro 6 regulations, so unlike older models there is no Euro 5 versus Euro 6 boundary to worry about within this generation. However, there have been running production changes to emissions hardware positioning and sensor bungs tied to specific engine build dates, so if a breaker is offering a manifold from a very different build year to yours, it is worth confirming against your registration that all sensor ports and catalyst mounting points match before buying.

Some BMW engines use a close-coupled catalytic converter mounted directly on or very near the exhaust manifold, but whether this applies to your specific engine variant and how it affects MOT emissions compliance is something you must confirm with the breaker against your registration. This is an area where getting the wrong specification — even from a visually similar part — could cause an MOT failure, so do not rely on a general answer and always verify the exact part number or application with the supplying breaker.