While Indomitable G may be significantly lighter than a stock G63, it could always do with a little more oomph. Adding another 50 hp to the stock 536 hp certainly helps, though if you want more, "further performance tuning is available, according the whim and budget of the customer."
Considering the base price is roughly $385,000, here's guessing it's all down to the whim.
Aaron Miller is the Rides editor for Supercompressor, and can be found on Twitter. He’s never been a fan of the Indomitable Snowman.