The E36M3 is known for breaking diff mounts and there are several braces available that help. I run one, have over 500 rwhp and over 500 lbs rwtq, and have never broken the diff bolt even on drag radials. I also use harder poly diff bushings and those alone might do the trick. I'd like to see a set for the E90M3 as an option short of solid and short of a brace.
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