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@Ericknav did you mean M3 rear bumper and not m tech (it's actually m sport btw).
To do a proper conversion, you need to cut and weld oem M3 quarter panels and then custom fabricate the rear bumper by cutting your existing bumper and plastic weld together an oem m3 bumper.
If you dig into the E91 photothread as well as the E91 FS thread, there is a decent amount of conversion information there. Hope that helps.
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