Grant:
KresoF1:

It is some kind of electrical turbo precharging. I got pdf that can not post here yet or send to someone but, car is a technical wonder. If everything works as described in this german pdf 991.2 will be the Benchmark.

But you are confident in choosing 991.1 instead?

No, I will take very low option 991.1 and get 991.2 as soon as orders open up. 

New engines are state of the art. They are more advanced then 488 GTB engine. 

My P source told me directly to order low options GTS(-20mm/SPASM and some items) since it will be an easy car to sell or trade. He also said that 991.2 C4S with power kit and all drive dynamic goodies is better in every possible way then 991.1 Carrera GTS(also equiped with drive dynamics goodies). Only thing where current GTS could be superior is exhaust sound.