Suggestion on bulbs? Do any relays need to be changed out when doing so?
No relays, but most (ie: not all) will require a resistor pack/inline resistor for two reasons: one, to eliminate hyperflashing turn signals, and two, to prevent bulb out warning messages in the dashboard message center. Any that mention CANBUS compatible probably won't require you adding a resistor.
Keep in mind an incandescent 3157 produces, in stop/brake mode, 402 lumens. This is the standard regardless of bulb manufacturer. Sure, there will be some variance, but keep 402 lumens in mind when LED shopping.
Diode Dynamics, arguably the best in the business, today lists 3 different 3157 varieties, all red, which is what you want contrary to popular belief.
280 lumens for
$40/pair,
310 lumens for
$60/pair, and
510 lumens for
$90/pair. Years ago when I ordered, they had two, don't remember the lumens but ballpark the price was $90 and $125 range. One was red the other was clear. I tried both. They both were combination side and rear firing, and of all the bulbs I tried, the Diode Dynamic felt and looked (in my opinion) like the best built. Thankfully Diode has an easy exchange/replace/return policy. IMO you want both rear and side firing if you want to actually benefit from LED.
If one of my LED housings were to stop working or catch fire, I'd replace it with another LED housing. Or my old housings, complete with incandescent 3157s.