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Originally Posted by Fidiman
Very impressed ... You did a really nice job mate 
Why did you put the M3 rear subframe and didn't you leave the e82 one ?
Now thinking of doing that job on mine  I will begin with mounting the anti-roll bars (F and R), bushings, arms, etc ... After I will concentrate on the M3 diff and some coils stuff.
Another question now : why did you chose a M3 DCT diff and not a manual one ? |
Thanks Fidiman!
The M3 rear subframe is actually constructed differently. I believe you need it in order to fit the M3 LSD housing in addition to the subframe being stronger and possibly lighter (not 100% sure on this though).
If you plan on doing the rear sway bar as well as subframe bushings, I would recommend just doing the whole rear subframe and diff at the same time. It doesn't cost that much more when you take into account labour to remove the entire subframe in order to install those rear components.
I chose the M3 DCT diff due to the final drive ratio. The 135i manual FD ratio is 3.08. The M3 DCT is 3.15 and the M3 manual is 3.86 so the DCT is closest in terms if FD ratio. A 3.86 ratio would be probably way too aggressive for street driving.