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cadena do you plan to replace the spark plugs with OEM? The spark plugs on the MY2020+ M550 are unique due to the higher energy coils used on the TU3 engine. I'd be careful about changing them to anything non-OEM. Also do the coils at the same time as the plugs.
If you don't have it already you should also get xHP for the transmission. I love spending other people's money!
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