One thing that's a plus with Ford's power pack is that Ford won't give you grief when you're in for warranty work.
As a matter of fact, Ford Racing Parts are covered by a Ford warranty.
Before anyone goes and "poo poos" this, take a good look at mod threads and just see how many members here "restore" their cars to stock or "reload" their factory tunes before going in for service.
Seems to me that if aftermarket is okay in all situations with the dealerships, you wouldn't need to do such a thing.
Can you get better numbers and better prices outside Ford? Hell yes
, but there's no dealership hassle's when dealing with warranty approved upgrades.
Just my 2¢