In fairness the engine is the expensive bit and the warranty will or should cover all engine accillaries.
Other failures don't tend to be so expensive or when they fail you can fit uprated 3rd party parts, like suspension etc.
The engine is the most common big bill to fail, gearbox, ECU etc, tend to be very reliable.
After 18 months though he is back to no warranty at all! That's a 10/11 year old Porsche with nothing to cover you.