I replaced the rear brake-lights (40W xx57s, not the usual 32W ones) in one car with JDM Astar LED bulbs, and the LED ones are noticeably brighter, and have that nice “snap” when blinking on/off. Better, the light is actually more uniform than the hotwire versions.
More JDMs for the amber turn-signals in my other car, and I think Luyed flat 2-sided white which worked out beautifully, shooting light down the 2 troughs of the [long’n’narrow] reflector vs going nowhere on the shallow end.
Hell, at night, sometimes I just like chirping the alarm to see the incredibly bright amber and white flashes in back. 
Didn’t do anything in front yet.
You used to have to worry about standard and “CK” type sockets, but not anymore, as a lot of newer bulbs are “smarter” and won’t pop your fuses if you get the wrong ones.
Point being, that some reputable mfrs have some damned good LED replacements for xx56 and xx57 type bulbs.