I added rear LED lights only. SoCal for the brake/tail light; I like it. California-legal brake flasher connected to bright LED array replaced the rear reflector. I like that, too. I have the SoCal load adjuster, which works fine.

I wanted switchback red/amber rear turn/running lights, and SoCal does not carry them, so I found the YouTube video and bought 7443 bulbs and sockets for that purpose. I like the function, but I don't think the amber LED turn signals have a wide enough spread for use in the rear. During daylight, anyhow. And the aftermarket sockets are not as robust as the OEM sockets, but some hockey tape fixed that.

7443 Bulb Socket Brake Turn Signal Light Harness Wire LED Pig Tail Plug 7440 T20 $5.99
7443 Red Amber Front Turn Signal Light Bulbs Super Power Led 7505 7444NA X2 $17.94

I really like almost all of that. The CA-legal brake flasher I wouldn't use anywhere else, since it allows 4 flashes, then goes solid. I would prefer a normal rear turn signal except I really, really want to be seen from the rear, so I like the full-width taillight. At some point I will add rear-corner amber turn signals, but have not done that yet.

Up front I installed Phillips "super-bright" yellow halogen high beams. I really like the yellow high beams; they get cars out of the way when I am passing or lane-splitting.