All Ielasi motors are hand tuned, but Daniele doesn’t do a modifying service for just any engine as you see many modifiers similar to Murnan do... The new Raptor .21 is Daniele’s variant to the new Mephisto Line from Novarossi. Consumers have the same access to the product they see run, there is no team special motor they are all good. A key difference other than the mods internally are the tolerance and roundness of the piston sleeve, and overall fit of the parts. You’re guaranteed a good engine, and noticeable difference in performance.