There is an Australian solution to 550 hp and 630 hp on stage 3 (fuel 98 octane) - ~18000 $.
There is a turbo solution from UAE for 550 hp (fuel 92 octane)- ~13500$
I have done a custom solution (compressor from Range Rover SC with 2 water intercoolers)- currently 693 hp, but ac go till 830hp (but am not sure about the engine and transmission). It is a custom - price was about 5000$.
A test run: