This is what I got from my sources in Europe..........

AFM

O.S. Engines .12 TR R (E) -Spec Competition Engine

New from O.S. Engines is the .12 TR R (E) -Spec engine. This engine is specially configured to take advantage of the new ROAR and EFRA racing rules and to make as much power as possible. This engine features a new Hyper cylinder head that uses turbo-style glow plugs, which became legal for racing in the small-block classes for EFRA, IFMAR, and ROAR recently. An O.S. 11A slide carb. is installed, which is a competition-bred three-needle unit, optimized for maximum airflow.
Three transfer ports feed the cylinder, which is important because racing rules don't allow for more than three ports. The R (E) -Spec features genuine ABC construction, but for 2004, OS made a major improvement by replacing the old molded piston, by a superior grade high-silicone aluminum, machined / lightened piston, and a new sleeve with touring car timings. Always lots of torque and now nearly same RPM as Italian engines, OS reliable, easy to tune, and no over heating. A hot O.S. T-P6 turbo glow plug is included in the package.

Here are the power, rpm and other specs:

Stock Number: OSMG2007
Displacement: 2.11cc
Bore: 14.0mm
Stroke: 13.7mm
Practical rpm range: 4,000-38,000
Output: 1.5 ps @ 31,000 rpm
Weight: 218.3g

E-Spec, is made to conform EFRA rules, and what this means, is that the difference is on the crank:
“The crank hole shall have a max. dia. of 7.00mm at its end. The hole my be finished with a continuous unbroken chamfer with a max. width of 0.50mm if this is required for manufacturing purposes at the crank web end.”

R-Spec, is made to conform ROAR rules, and I would add it also conforms to IFMAR rules, were there is no restriction on crank hole size, or chamfer size at the end of hole, so flute on the turbo crank face may integrate into hole…….so it means MORE POWER…..