Pretty sure the road from Mt Isa to Birdsville is fully sealed now.
https://birdsvillehotel.com.au/
Give these guys a call they will know for sure.
Don't go stupid with the throttle
Do a 4x4 driving course before you go
Enjoy

Pretty sure the road to Birdsville is all sealed now

Once you get there
Then what?
Drive thru the desert?

Use a smoke machine to test the exhaust otherwise you're just taking a guess if the exhaust is sealed fully or not

The exhaust shop will have the threaded inserts on the shelf to weld in place. And no doubt a centre punch to mark the hole with and a drill and correct size bit to drill the hole so the sensor go thru. An exhaust shop is an exhaust shop If they do exhaust for bombadore and found on rubbish dumps , ...

Dunno how you came up with the idea that the expensive part is the O2 sensor mount. A decent exhaust shop can get this knocked up very easily. I got a 2.25" system installed with Lukey muffler and 200 cell cat from memory for around $350 In the grand scheme of things, that's quite inexpensive. ...

Save your pennies up
Go talk to a exhaust shop and get a custom Mandrel bent exhaust and toss the OEM over your shoulder
With a 200cell cat your will hear and feel the difference
Even more so with a ECU tune

Good luck
Talk to merlin.tuning@gmail.com

Hope you enjoy feeling every bump in the road after you shove the bushes in you plan on getting from super pro OBD2 tool , your better off to get this if you have Android phone https://www.amazon.com.au/ScanTool-427201-OBDLink-Bluetooth-Professional/dp/B00H9S71LW Or just get a cheapie $100 android p...

I spoke with Merlin not all that long ago
He absolutely is still doing tuning

No need for bigger radiator I know guys who race / rally the NA with stock radiator and zero issue The idea of Bigger radiator is yet another internet perpetual BS story to make you think you're going to work wonders with the ECU/ motor If your really serious about getting decent power out of the NA...

Don't touch the radiator or the radiator cap Way to many wannabe rev heads do this to EFI cars and wonder why the performance goes down the drain and it sucks fuel like no tomorrow When you shove a bigger radiator and cap on (all the top of the line wannabe go at least 10 degree cooler with the radi...

Bluetooth?
Wiring for the steering wheel controls?

Yeah most aero bits on road cars don't really work, and even if they do won't work (or be effective) until you're well over the hwy speed limits. They are mostly there as a feel good exercise for the driver and for others to mock. I bet if I took the big VRX wing off the back I'd get better hwy eco...

Wreckers

Yup
That's the one