The car has been around for awhile now and is popular. So a good portion of mechanics have probably worked on them.
I just did a google search of "Brisbane import mechanic" a few popped up
Looks nice. I couldn't see what version Android Auto it was.
Best to ask before buying. You don't want to be using something that can only use some old version like android 7
https://conceptzperformance.com/hks-hi-power-stainless-steel-catback-exhaust-system-titanium-tip-infiniti-g37-q60-coupe-rwd-cv36-32009-bn003_p_4502.php
https://conceptzperformance.com/dc-sports-headers-ceramic-vq35hr-vq37vhr-nissan-350z-370z-infiniti-g35-g37-q50-q60-awd-rwd-nhc4202_p_2548.php
I had these https://conceptzperformance.com/kn-typhoon-air-intake-dual-kit-vq37vhr-nissan-370z-z34-infiniti-g37-q40-q60-69-7078ts_p_14230.php
But wanted these https://conceptzperformance.com/stillen-generation-3-ultra-long-tube-dual-intake-kit-infiniti-g37-08-13-q60-14-15-coupe-cv36-402846_p_2880.php
Google or ebay for your items.
There are is lots of info about the language conversion in this forum. But some Audio shop or import shop in Victoria should be able to help.
Some forum members would have all the info you need but they might not come online for weeks or months or ever
Also just make sure the Fuel sensor is clean.
VERY common that they give a false reading to your fuel gage. E.g if you Fill "to the top" car up and it shows just under the "Full" line then its wrong.
Just use a cotton tip to rub the metal contact points on the sensor attached to the pump
No tune needed after putting on intakes or exhaust. But if you do get a tune you will get better performance.
Sound of the exhaust.... beauty is in the ear of the beholder.
Bose audio is an option
S=sport, bigger brakes
P=premium, full leather seats
SP you get both
You can Bluetooth your phone to the car. there are videos on YouTube and threads there about how to do it.
Did the long intake give you a nice sound from the engine bay after install?
I had short intakes and only got a very little improvement on sound on my V36.
Unlike the V35 "Z tube" intake makes a huge improvement