harry just sent message to you, Thanks.
Here is a link linking up the post for the seperate piston manufactures information. It is still a work in progress but should be wrapping up shortly.
http://www.bimmerwerkz.com/forum/3-s...5-a-67052.html
I will be doing the 2.7 crank(81mm)/ 2.5 rod(135mm) and a custom piston. I have spoken with a few people, they have been a big help and will be mentioned in my final write up, that have done this build or similar (NA). In addition, manufactures that have done this configuration for their own build motors and custom pistons for this same build to direct customers (like me shortly).
Trying to keep everything together, sorry for highjacking.
rvaughnp