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Hey,
I've got a 2015 335i X-drive with a 6mt. You definitely want to check if the transmission grinds or completely won't complete the 1 - 2 shift. If the previous owner constantly drag raced and abused the transmission, it could definitely have extra wear that could result in problems developing later.
The other thing to consider is if you intend to mod the car. From my research it seemed that the 6mt is pretty much at its torque rating with the 335i. That's probably why with the M Performance Package II, the ECU re-map limits torque in 1st and 2nd to 320 lb-ft, but allows 335 lb-ft in the other 4 gears. Any mods adding boost will pretty much exceed the transmission's torque rating. Even though the transmission won't fail immediately, it would likely only be a matter of time before symptoms of a failing transmission started becoming apparent.
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