I've been using the mars clear red led tail lights for almost a year now on a 2004 4.4i:

• I get the check tail lights message on every cold start, but only occasional on a restart.

• Flickering stop/tail leds , this flickering goes away after a couple of minutes. I couldn't see any resistors on the wiring with my lights.

• The stop light led are really really bright - quite useful at night as the reversing lights are quite ordinary.

• Only the stop/tails are led, the indicators use your standard bulb.