I have been in contact with Brey-Krause who make harness bars for a number of vehicles. As you have seen below in another post things don't look promising for the Schroth harness system. I have looked into an alternative which will be a bit more costly, but you would be able to install a more secure harness system. See emails below. We need a volunteer in the Bethlehem, PA area to get the design going. Can anyone help?
We do have plans for developing one for this application. I am currently looking for a test mule. I have e90 and e92 335i chassis lined up, but I want to use the M3 first then check compatibility on the 335i – not the other way around.
Do you know if anyone that is interested that is located close to Bethlehem, PA 18017?
From: Victor Hirth
Sent: Monday, March 26, 2012 6:27 PM
Subject: harness bars
Do you have any harness bars in development for the e90 M3 sedan.
There are at least 30 of us who have given up on Schroth coming out
with a quick fit system for our cars and we are now looking for
alternatives to fit our cars for track days. Do you have anything in
development? If so, when will it be released and if not, is there
anything that might motivate a production run of harness bars for our
application. Thank you.