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Originally Posted by Nugget
According to a thread on N54 tech the M3 steering rack is a direct swap with the 335i.
You could be the first to give it a go on the 135i 
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M3 steering ratio 12.5:1
335i steering ratio 16:1
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From the bits and pieces I've picked up on realOEM, talking to HPA and talking to Pete, I'm not sure it will work. I think that 1Ms and M3s came with active steering only whereas mine does not, making it not a direct swap unfortunately. I would of course love to be wrong. Very wrong. I'll check out the thread. Thanks for the heads up.