All thanks for the great track advice over the last 4 years, I sadly traded in my 135i for a 2017 X5 x35i last Friday. Still keeping true to the N55 for better or for worse.
The 135i was a great car to learn how to drive on track and helped me raise my driving skills onto a whole new level with plenty of room left to learn. It was to the point of either keeping the car somewhat drive-able or begin dumping $$$ into the car for racing which didn't make to much sense long term.
I am onto pursue Spec E30 racing and Champcar Endurance events over the next year and needed a car capable of towing.
If your in the NYC area there is a 2012 BMW 135i DCT with an ER Oil Cooler, rebuilt brakes with Stoptech pistons w/ lines going up for auction soon
Cheers