That was some good fun! I couldn't stay the whole day due to exhaustion and other commitments but I was able to get two runs in before leaving. The 135 did very well through a unique and challenging course whose slalom design, I still don't fully comprehend.
Met some nice folks including, I think the OP and a few M3 and 335 owners. It was a well run and well organized event. Kudos to BMW CCA - LA Chapter!
The iPhone isn't really a good device for these events, but a couple of pictures came out ok.
