Just ordered a 2018 Mazda 3 GS sedan, I was wondering what the best and easiest way is to replace the halogen bulbs to LED or HID. Ive seen videos where guys took down the whole bumper and also the wheel well cover in order to access the bulbs. Also is there enough voltage to upgrade the high beam/DRL bulbs too?

Thanks

 

Bad idea; halogen bulbs throw light in a different pattern than LEDs, the result of such a change may result in reduced forward visibility and/or blinding oncoming drivers. Then there is the issue of the housings; they were not designed for LEDs and a they heat pattern they produce and may melt.

If you feel you must fit LEDs to your car, your best bet would be to buy entirely new headlight housings designed for LED bulbs (don't even know if such exists for the third gen Mazda3).