(Feel free to skip this, since there is a lot of opinion that doesn’t directly answer your question.)

No doubt, GT3 is the best move, if money isn’t a concern. It is made for the job.

There are lots of sayings about the cost of speed. You’ve got to pay to play, and the cost of each incremental gain at the high end is much steeper.

You’re much closer to track prepped starting with a GT3, but you’ll still need to throw money at it to get it “fully prepped”.

I can’t comment on turbos on the track, but you could build a heckuva’ C2 with a Raby engine, an open trailer and a used tow rig for about the same money as a single manual 996TT prepped for the track.

In my very limited racing experience, the fastest cars are driven by the best drivers. Money would be best spent on track time and quality instruction before buying another car.

Also, compromise cars (drive it to the track, drive it home), are less likely to be tuned to the razors edge of high performance. A real racecar is nearly unbearable on the street. Sound deadening, cabin cooling, audio, carpets, trim, dash, street crash safety measures (like safety glass, airbags and side impact bars), etc. get sacrificed to reduce weight. Suspensions are so taught that they rattle your fillings. Etc. I tried to do that when I was in my 20’s and it sucked.

One last comment about driving the car to and from the track is that if you have to worry about driving it home, you are unlikely to be willing to drive at 10/10ths. Stuff happens at speed and to go the fastest, (in my opinion) you have to drive close to the edge. You can’t do that if you’re worried about driving it home or to work the next day.

My dream car is a GT3 RS. It’ll probably never happen due to the buy-in cost. But I can always dream.