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Ahh ok, now I'm with you. Yes, the M3 does have a larger cooler for the DCT, but it is located under the passenger side headlight where the 135i's oil cooler is located. The 335is DCT has the same trans cooler as the 135i. It is located at the lower driver's side portion behind the radiator. Part number 17217536929 (heat exchanger).
I'm sorry if I made it confusing, but the 135i and 335i DCT cars have an OEM trans cooler, but it could be upgraded to be more effective, as with most things when dealing with cooling on these cars.
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