https://bimmian.com/Accessories-for-...-Signal-Bulbs/
After much research and WeissLicht's claim of no codes, I purchased and installed the amber LED rear turn signals yesterday.
A five minute process; perfect fitment, incredibly bright (3X), crisp on-off.
The WeissLicht product integrates no code issues, well designed heat sync, lower wattage yet mega-brighter than OEM.
I called Bimmian and asked why there isn't an app for the front turn signals on their site; they said they reality-checked all types, and cannot find one that does not throw codes or does not fit.
The crisp LED on-off and brightness is absolutely awesome.