HP Autosport, Inc. did all the R&D work and brought the E90post and 1Addicts community the M3 suspension conversion kits back in 2008. With increasing requests, HP Autosport is introducing the M3 strut tower brace kit for your 128i and 135i.
Gone are the days removing the oem brace to get to your rebound adjustment knobs on your struts or change your camber settings for HPDE or track days. With this M3 strut tower brace kit you will be able to access those adjustments with ease.
The "Mount", the piece that bolts to the firewall has been modified to accomodate the different firewall angles found on the 128i and 135i.
The last three photos are the M3 strut tower brace installed in a pre-2011 135i with the N54 power plant.
Independent review by "Alpina B3 Lux"
http://www.e90post.com/forums/showthread.php?t=590096
***The heater closing panel may have to be removed or slightly modified to install the M3 strut tower brace on 2011 vehicles. It's number 13 in the parts illustration drawing***
Includes all parts needed for installation.
$775
Order here:
https://hpautosport.com/product/bmw-...wer-brace-kit/
If you prefer to buy your parts else where and wanted the modified center support mount only, you can order that here:
https://hpautosport.com/product/bmw-...er-mount-only/
An inexpensive set of E Torx Sockets that will help you with this installation:
https://www.amazon.com/gp/product/B0...f738e46857b05e