OMG, really?
You need upgrade your driving skills first buy getting more track seat time. Also, transmission cooler should come after you upgraded your coolant radiator.
Don't forget that BMW installed additional coolant radiator not transmission or oil cooler in their PPK.
It's coolant that cools the engine.
But if you still insist on getting transmission radiator reach out to DirtKurt
http://www.e90post.com/forums/privat...&pmid=14555148