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Sorry to bump an old thread!
I am in process of installing a 3D Design diffuser which was meant for an M5 on my factory M Sport rear bumper.
If I do nothing to do the Comfort Access module and antennas and TPMS module i.e. leave all it alone, will most aftermarket diffuser clear the non-M5 adapter to reinstall? I think yes except then CA signal will be blocked?
Thanks!
Edit: reading more it looks like the original adapter will not fit due to modules blocking the M5 style diffusers.
Edit 2: wanted to confirm with M5 adapter + aftermarket M5 diffuser, it all went back on easily and Comfort Access works like before. Like others I installed both top and bottom CA antenna into the M5 adapter then taped both the TPMS and CA module behind the metal crash bar.
My car is a 528xi with factory M Sport + 3D Design diffuser meant for M5 painted black. Note for any N20 owners you’ll need to notch the diffuser due to width of factory muffler (see pic with blue tape).
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