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      01-22-2021, 07:57 AM   #2
mad1stgen
Master Wagon Builder
United_States
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Drives: F31 Unicorn
Join Date: Apr 2014
Location: Metro Detroit/Tampa Bay

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You can walk into any BMW dealer and order the e91 msport bumper. You can also place the order with countless online retailers. Non PDC part number 51127907255.

What you're suggesting has been done countless times with e90m3 rear cover adapted to e91 rear end. It's very doable, takes a lot of time and obviously $$$. The final product can be good, but the first time you get bumped, you'll be doing it again.

I would advise you against it in this case where you can buy one off the shelf without any issues. I've bought probably 15 of them in the recent months/years.