IIRC the connections on the OEM oil cooler are a special design by BMW, so simply putting in another core won't work.
I looked into that, but you have to get adapters to connect to the new core to the existing plumbing, or buy new oil lines, plus there will be some fab work to do also.
You're better off waiting until Black Friday and get a ER Sport oil cooler for less than $600. I think thats the best solution out there if you simply want to upgrade to a stock part to a more efficient solution and don't plan on hammering the car at the track regularly.
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