So I messaged MCA and got a reply from Josh.
Let me start by saying I can see why people like them, Josh's customer service is second to none.
He told me there are the versions of the new coilover that is between the red and blue series.
X-C - comfort road orientated, great ride quality
X-D - drift orientated
X-R - 70% track 30% road setup, great value for the level of performance you get and still quite streetable.
So I asked about a red series that is valves or set up the sane as the X-R series and what would be the difference.
And I received this great reply.
"Hi Mitch
Yes in theory, with the right kind of requirements, you could end up with something similar to the X-R valving. With other models of cars that have mcpherson strut type suspension, like Subarus, Evos, Silvias, etc, there would be many different external features, however in the case of the skyline being just a typical coilover type of suspension there is much less you can do externally, but that's also why they are much cheaper than the other types of cars. So the main difference with the Reds if the case arose that the valving was to be similar to the X-Rs would be that the Reds go through a much higher quality control system.
We take a lot of time with the build of the reds, double checking everything and making sure each component is perfectly clean before assembling. They also do still benefit from a high grade oil (the same as used in our golds) which handles high temps a lot better. Then each shock is thoroughly dyno tested. We run each one on the dyno at various damper adjuster positions to make sure everything is working correctly, we then compare the shocks left to right to make sure that they are even and there's no slight differences. It is also used as a test for seals as they are put under load, and gives everything a heat cycle and potentially frees up any initial friction there might be before installation. If at any stage something isn't exactly how we'd like it, it's pulled apart and fixed and re-dynoed. Plus there's the time taken to make sure that valving similar to the X-R would be ideal for you in the first place.
Hope that explains it ok.
Let me know what you think.
Regards
Josh
"