And therein you prove my point. You think they have 500+, when reality on a good day would be barely 400+
With an unladen weight of 1800kgs, they are no lightweight, nor a sports car, and new they are half the price of cars you are trying to compare them to.

Other than them all being cars with wheels and engines, there just is no sensible comparison. Totally different markets. And as the Monaro is a relatively cheap car, if something goes wrong it will be a much cheaper fix than the German machines.