Catalytic Converter

Hello Sir, My name is Arindam Ghatak and my company is based in Bengaluru. I am enquiring about 3-way catalytic converters that can process CO, NOx and hydrocarbons. What is the biggest metallic substrate diameter that you have or can make ? Based on that, I need to fit several of these into an insulated pipe (NPS 12, Sch. 20). I am assuming you do not make or cannot make a metallic substrate this big. Based on this information, I will let you know what quantity I require. Also, what is the length of these substrates you current make and the maximum length that you can make ?