Boss were distributed by Schepis Model in Italy!
They are based on the Sirio CL7R, but tuned by Mario Rossi.
Prior to the Boss range, Schepis Model had their own line of engines named "Schepis" which were based on the CL7R also but essentially a tuned down version
Schepis Model 21 Pro:
Mario Rossi joined Schepis Model in 2009, they released the Boss range of engines which were also distributed by Schepis Model.
Mario then proceeded to start REDS, which originally were also Sirio CL7R based.
Then moved onto making the REDS which we know today which are Picco based engines!!
Sirio started to produce the Sirio - Seven On which was quite a bit different, then the IDM T7T and now the XRD F21HT
All these have roots in the CL7R and are made by LM, despite what they might want you to think