Any LED bulb that is used to replace a halogen bulb on the lighting of the car will need a resistor, unless it's interior bulbs. Which just need to be canbus.
So, if you change your front signals to led you need to wire up a resistor for each side, and same for the rear.
This will avoid errors, hyper blinking and random blinks.
If anyone is just trying to get rid of the yellow bulb look I would recommend a white halogen/chrome bulb that lights amber.