Sarb,
thank you for the hint. I do have a E53 4.8is 2006 and got the Sonar - Spyderauto LED taillights.
Due it's flickering, i contacted Sonar and they told me to add a 10 R 25 W resistor to each side, which i found strange.
Well, today i added the 6800 mF 50 V capacitor to each side (wires green and black from the taillight harness) and it worked perfectly.
No more flickering and steady bright red leds.
Thank you again for your post.
Solved all with US$ 15.00 (equivalent in Brazilian Reais).
BR,
Paulo

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BMW E53 4.8 IS 2006 -