911 991.1 C4S upgrade to what ??

[Bolognese2]

Here it s the dilemma
Currently driving a 2014 991 C4S
3.8 NA , manual, 12,000 miles.
weekend only car, been to Silverstone Porsche training, Millbrook proving ground, several alpine passes.
a great great car. absolutely love it. Not the fastest but the NA + manual combination for me it is great.

I tried the 991.2 and was not over impressed.
my question is, upgrade mine to what ??

not keen to go down to 3 litre turbo engine of new 992.
Ideally I would like a manual.
seems the only natural step up is a GT3 ??

never tried a proper Turbo though