2 Clubmembers did get .12 engines as sponsoring and they were not the fastest. There were some tunings issues which were solved by using Novarossi carbs (I have also seen with .21 engines) and the speed did came after a lot of changes in the cranktiming.
But a good thing was the lifespan of the .12, I believe 1 of the engines is still running after 2 years.
Speed is only fiction but a 130+km/h MRS4 is for real.
If they are rebranded models I would think they were made by SH. They have same coulors purple and gold on their heads as SH and the design does have some same looking spots. Others say they are just Novarossi but then the quality and performance must be better....
O.M.G this guy don't know what is spm at all. they are the factory that make engine for novarossi and picco engine block in large numbers and spm come out with their line. and they make their own carb. and heat sink.