QUOTE(rangeseven @ Sep 11 2019, 02:03 PM)
i would prioritize on comfort and safety really
dashcam - is a necessity for your own protection
headunit - android head unit
speakers - change front speaker with tweeter is good enough. no need rear / subwoofer upgrade
tyre - get those Ultra High Performance tyre like Hankook Ventus V12 evo2
leather wrap the seat.... although some would complain seat become hot in malaysia
my next target for my car is noise insulation... can do slowly... do whole car i think 2k
For these things you do have to upgrade the electrical system and interior.
My suggestions are beefier motor (some cars can use dual purpose motor which is also starter that can output higher amps and is beefier so last longer), then add more 12/24V sockets. Accessorise a little, if you have the arm rest at the back, see about adding storage, socket there, even cupholders.
In addition to that you can get decent modulated sine wave plugs that let you plug regular AC powered devices into them with only 2 things to worry about, amps (starter and wiring) and what devices you can use. Only AC motors cant be plugged into them and some devices that like continous waves but electronic devices work fine. Wiring is very important too for the amps even for additional DC sockets.
You can upgrade the chairs. In some cars the chairs are removable so can get newer lighter chairs, even ones with storage, tray or even upgrade to leather if you use fabric. Rear chairs can consider if can add storage. Some cars have chairs that can be folded to reveal storage, or have storage bins under.
Definitely get your car tinted so it wont be hot.
Additional DC sockets let you plug in stuff, and also extra wiring to install more things. I would put the android head unit as optional but i would strongly suggest a reverse camera with wireless screen (scotty kilmer has a good recommendation on specific modal), as to me ICE is pointless, as i got my own tablet and such, so might as well just have in car adapters for laptops and USB ports to charge phone and tablets, even power dashcam, rear camera screen, and interior mounts for them.
to me having an android unit as ICE is pointless since as you drive you arent supposed to be looking at the screen but the road. Its only worth if you can tweak settings in your car (which can be a thing if you connect to ODB port to show live data like fuel consumption, and sensors like speed in a cool way you like), but otherwise its pointless even for passenger as at the back it doesnt help much and you arent supposed to operate it either.
If you have storage that isnt part of your boot, you can add a small fridge that can be powered by DC, but that just depends on your budget, i wouldnt say its expensive if you can fit an off the shelf tiny fridge but also depends on your needs.
Lastly if your car doesnt have, a full sized spare tyre.