Agree with Steve - I was up Rocky Track a couple of months ago in my Rangie & wouldn't suggest it's a nice place to take a NGV!, but then again, the STT PRO is what most people would call an M/T tyre

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Only have experience with Safari Snorkels, but although Safari says it doesn't fit, it's only the angle of the entry to the air box which is different from other engined cars - Safari haven't made (& are unlikely to do so) a new rubber moulded intake tube (huge, complicated thing) to go between the snorkel body & the air box.
An exhaust shop can slightly expand a bit of pipe to fit & then cut & shut the pipe with a kink, adds a level of dicking around & arguably restricts the intake a little, but probably not enough to make a noticeable difference.
Underbody guards better protect the car (than the factory plastic bits), but reduce ground clearance.
I agree that it is very easy to lift a NGV too far, and that that is not very far!, but it would be good to have enough lift that the car wasn't worse off for clearance than it was, without the protection.
ARB, via OME do a kit for these cars & one of their HO employees has a SWB with an ARB bar on it - might be worth checking it out, as you seem to be in Vic. out that way.
The exhaust, as it goes under the rear suspension is vunerable, not practicable to fit protection to & will be aided by a bit of suspension lift, having said that, it is one of those cars where you have to learn to live with being low - teaches your daughter to study the track & be careful with picking lines!.
Some people like the look of the Xrox bars......not me, but as was mentioned, recovery points are a tricky area as well.
Good luck with it & welcome to AZ.
Rgs, Michael