I agree with Mike. It could be said that 414hp is an achievement in its own right. In fact the twin turbo V8 in the X5/6 non-M SUV's have an extra 100hp that Dinan can pull out with their tune and boost control.
I think it also allows for car manufacturers to monetize on those who want every bit of HP left on the table.
2009 AM V8 Vantage Conv - Berwick Bronze, Quicksilver Exhaust
2013 M3 Conv - (RIP) thanks to uninsured a-hole
2004 Porsche 911 C4S Conv