Originally Posted by tom @ eas
Small world - I've actually been looking into the MXL unit to be used in a 135 for Street RWD class in Time Attack next season.
Depending on the size of the harness, there's an opening on the firewall within the ECU cabinet about 1" in diameter - this makes an easy route for connecting directly to the DME or entering the engine cabin.
Here's a tech article that I posted that will show how to gain access: http://www.m3post.com/forums/showthread.php?t=329420
Feel free to call or email me directly if you should need additional help.
Thanks for that Tom. We have been to some of the Time Attacks at Cal Speed doing support. I will read the article for sure and most likely call you on Monday. There are 2 of us at AiM that have E90/E92's and we are both having connectivity issues. What is really strange is that just yesterday I connected to a 2008 135 via the OBD port and was able to pick up CAN. It was limited but it was there. Yet on a 2008 328 and a 2007 335 it is not....???