Originally Posted by tom4416

Anyone thinking about converting halogen to LED should read this from Daniel Stern Lighting: Daniel Stern Lighting Consultancy and Supply

Given all the LED junk that is coming from China, even if you get them to play nicely with the systems in the vehicle, they are not the upgrade everyone thinks they are. The article mentioned does a good job of explaining why. Some of the better quality companies are working on a true conversion bulb for halogen but they won't be the $29.95 a pair from China ones. Properly designed, built with quality solid state components and then cycle tested, they will probably be $200-$300 a pair but actually be an improvement with proven longevity. In the meantime, stick with stock no matter the year of your 4R.