Problem is - he is in Melb.
You need an arsehole that can take a firehydrant if the cops pull him over with that, and the likelyhood given how things are down here ATM is highly likely...
It's basically engine out, install stock motor and then re-reg with a different motor & start again. Fark that.
As Paul said look into the GTX lowmounts if you want stock-ish appearance, but the custom piping will mean it's really quite obvious.
Do not go near the -10s/GT-RS. Worst turbos you can possibly buy. I cannot think of one user who has taken them off, and regretted doing so - that's how bad they are.
Hate to say it but if you want to have a stock appearance about as much as you'll make is 400-440rwkw with HKS 2530s, and when I say stock, it'll look 100% factory.