BiTurbo:
RC:
This is quite close to the truth but the last part, isn't. Production is mainly limited by supplier capacity (within that mentioned specific time frame). Yes, it is very difficult to get a GT2 RS but it is impossible to get a 911 Turbo S ES.
I dropped my Lambo today at the service center and was told you can put down a deposit this month and will get a Performante within 4~5 months. No acting, No BS stories with limited time / production or selected number of buyers will be given the privilege to get their hands on one.
Around spring, the Performante delivery time was a year in Germany and dealer wasn't supposed to take in orders for the next 6 months. I guess this has changed a little bit.
I wonder why would one go out of his way to pay almost as close as Performante money for the Turbo S Exc with no guarantee whether he'll get one or not, it's just a souped up aerokitted Turbo S with different paint and an awkward (ricey) stitching 

The GT2 RS is a beast, no doubt about it. If you need a raw track car, this is (probably) it. Most powerful series production 911 too. The Performante is a different kind of toy. Yes, I would get the Performante over the GT2 RS in a heartbeat but this is me, I love the R8, so why wouldn't I love a more powerful and track-capable version of it?!
No matter which one, both are amazing products but personally, I feel more attracted to the Performante. Even if the GT2 RS probably crushes the Performante on the Autobahn.
The Turbo S ES is more of a collector's car in my opinion, at least for now. There have been rumors Porsche will offer some of the ES options for the Turbo S later on but so far, these rumors haven't been confirmed yet. Right now, it is more difficult to get a Turbo S ES than a GT2 RS. This is a fact.
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RC (Germany) - Rennteam Editor Porsche 991 Carrera 4 GTS Cabriolet (2015), Porsche Cayenne S Diesel (2017), Audi R8 V10 Plus (2016), Mini JCW (2015)