55WL cylinder may be too big for a Cuore. Eco version has a 50WL cylinder. I'm not sure about the kit. I've drive CX Eco and the performance is pretty decent.
I've asked at a couple of Toyota showrooms and few CNG fitters as well but nobody has been able to tell me what " Spark Adjusting System (SAS)" is in the Eco version. I believe it is a fancy name used by Indus Motors for the timing advancer.
Recommendations for kit, cylinder and advancer needed.