I'm thinking of replacing the stock rear steel strut tower brace w/the
- alloy strut brace 31127855855 (superceeds 31122284855)
- extension, strut tower brace, left & right 31122284857, 31122284858
- reinforcement spacers, left & right, 31302285700 , 31302285701 - these look like they fill the gap and reinforce the strut tower.
This combo looks like it will add the majority of the stiffening, if any, over stock.
The newer strut tower brace (31127855855) is also showing on the M235i racing and M4 GTS
http://www.realoem.com/bmw/enUS/part...55&series=MOSP
Anyone know if the 41008417085 strut brace (U shaped one) used on the M235i racing is also carbon fiber or some other material?