And the sump baffle, is that a good fix for oil starvation? You seem to have been tracking the car quite a bit and the baffle seems to be working for you. The S55 oil pump conversion is pricey at 3500 USD without install. If the baffle can get the Job done then I would go for that.
I just got curious as I am migrating to the UAE next month. I currently drive a 640i grande coupe and love the car.
But while in the UAE i am strongly considering getting a 640i coupe and turning it into a dedicated track car coz why not

. It is also N55 powered and will be unique inits own way as noone has really done that. Cars are dirt cheap in the UAE so that is another motivation then get hit the circuits that side.
I pretty much would be using your thread as a guide for it.