From Porsche's Exclusive Catalogue :-Originally posted by flat-6
Wtf is the X50? Is that a power upgrade or something?
The Turbo Performance Kit (X50) - For the 911 Turbo, we've modified a number of key engine and drivetrain components, including turbochargers, intercoolers and gearbox. Given the extent of the modifications involved, the Turbo Performance Kit is only available as a factory fitted option.
Basically GT2 turbos and other stuff upgraded to cope with the power
Other options? Sat Nav, but most stuff is already standard on the turbo. It's really just trim, colour etc.