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If you put all of the M3 suspension bits that are in the 1M on a 135 it means you'll have to widen the wheel arches as well, then you have to change the flywheel, get a different steering rack, not to forget a LSD and maybe some new seats, chances are when you're done it would have been cheaper to buy a 1M in the first place.
I'm sure with the right careful selection of mods upgrading the drivetrain and the suspension of a 135 you could end up with something close enough to a 1M, and if you already have a 135 maybe that's cheaper to do than selling it and trying to get a 1M but you probably would have to be very good at picking those after-market parts and end up with a package as good or as well matched as what the M engineers ended up with in the 1M, they after all had the luxury of being able to try any existing part in the M catalog bolting it on go for a day lapping the ring, record the lap times and then trying the next part, etc... until they got to the 'right combination'.
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