I have installed friends CNG's Lambda system and it is working great, as for stanley yes they charge high b/c of Faber cylinders. See i purchased 70 Liter Cylinder for suuny,2005 and it cost 55,000/ and at the same time inflex 70 liter was available for 21000/= what was the major difference weight faber weighs 64kg and inflex weighted 80kg. If you go friends meet hamza the owner he is there after 3.00 pm and the one who install's Lamda system. You can give him my reference Dr. Aqeel, i am his and fathers consulting physician.