Dear Nonee,
As i am using CNG in my EFI car Toyota Platz and toyota Vitz and Toyota SE Saloon, since 8months, 1.5 yrs and 1 yr respectively. there is no problem as all the cars are Automatic and i installed the kits from Hitech the owner of that CNG Workshop is Mr. Faraz he is genius and friendly person. so you can install it from ther for hessel free installation and guaranteed result.