I'd recommend adding trans cooler in-line with oem trans cooler. Ambient temps in our area may not be what they are in central texas but mountain passes, towing in stop/go traffic can get trans temps close to mid-200s. In-series keeps them under 180 no matter what.
I can relate to the bmw thing, yet I'm very lucky. I don't have one but gf does, an 06' 330 ci, same red as yours. Very luckily her son is a certified master bmw mechanic so all i do is oil changes. Nice how those guys work in a/c and heat on floors you can eat off of! Luck and enjoy that very nice runner.
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2001 Limited 4WD - 346+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.
