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The GT3 RS MR has been in development for over a year and it has gone through evolution, after evolution, after evolution, but it's looking like Manthey Racing is finally ready to officially reveal it's latest and most insane creation to the world, as earlier this week 2 new prototypes were photographed with almost no camouflage, the logos and decals completely uncovered, and many of the new aerodynamic components appearing in production ready carbon fiber. 

Manthey's development of this car has been nothing short of extensive, as we've seen no fewer than 6 different prototypes, which is pretty extreme when you consider that Porsche themselves typically do not use more than 2 or three prototypes when testing a new car. And when you consider how rare and valuable the GT3 RS is, that just makes it all the more insane. What will happen to all of the beautiful cars that Manthey drilled and cut into and then beat up on the track, is something I would really like to know. 
The latest prototypes show even further development of the already over-the-top aerodynamic components, which tells us that Manthey is definitely out to break records with this car.  

Upfront the new splitter has received additional tweaks from the last time we saw it, and when we compare it to the stock splitter on the GT3 RS, we can see just how much work Manthey has put into it. 

The center has been lifted to allow air to pass underneath the car, and the sides are lower to generate downforce. The outer edges expand into complex ridges on the top and bottom to control airflow around the bottom of the car. And two support rods help to stop heavy amounts of air pressure from pushing the splitter downward.

The entire front fascia has been redesigned to accommodate the dive planes, the new splitter, and the deflector that takes the place of the front canard on the stock GT3 RS. This lower indentation is now gone and the car looks better without it. 

On the eight fins mounted on the roof, the inner six appear to be relocated slightly farther back to provide more accurate airflow around the rear spoiler. 

And at the back of the car, where most of the action is taking place, the new aero components look to be finalized. The huge vertical fin has been redesigned and now appears finished in carbon fibre, and as I predicted in previous videos, there is no longer a rear window. The removal of the rear window was most likely done for 2 reasons - to accommodate the horizontal fin, and make the vehicle lighter, as there is now a thin carbon fibre plate where the glass used to be. 

The ginormous triplane wing looks to have been slightly updated once more, with a reshaped top wing, and now that the enormous endplates are fully exposed we can see several points where the 3 wings and the endplates themselves can be adjusted. 

The area of the car that has seen the most ongoing development is the rear diffuser. The last time we saw it, it was looking like the diffuser from a 911 RSR but since then it looks to have been completely redeveloped. The six fins go much deeper, there's now vents at the top of the main tray, and there are new layers and components added to the sides. The hardware and braces on the rear diffuser suggest that the diffuser might be adjustable.
The rear wheel disc is looking a little drab, but the production version will most likely look like the carbon fiber example being made for the standard GT3.

I've been wondering if this car would remain street legal, and this photo showing the turn signal in use tells us that it will. 

It's believed that the GT3 RS MR will not be receiving a power increase, but there should be plenty of other performance upgrades, including four-way coilover suspension, competition brake pads, stainless steel-braided brake lines, ultralight wheels, and some of the body panels were most likely produced using lightweight materials. And we can expect to hear about additional performance upgrades once Manthey officially reveals this car. 

The stock GT3 RS has a nurbergring Nordschleife lap time of 6 minutes and 44.85 seconds. The current record holder is the Mercedes AMG one, at 6 minutes and 35.18 seconds So in order to reclaim the nurburgring crown, Manthey needs to cut almost 10 seconds off the time of the stock GT3 RS, which would be a pretty significant accomplishment - but not an accomplishment outside the reach of manthey racing. 

Before the AMG One became the champion of nurburgring lap times, that crown belonged to the Porsche GT2 RS MR, which was nearly 20 seconds faster than the stock GT2 RS, and manthey achieved this huge gain with only minor modifications, as you can see when we compare the GT2 RS MR with the stock GT2.