I'm from coastal town Mangalore of Karnataka. I admire the knowledge of this forum members. I own Volkswagen POLO Comfortline TDI 2013 model. I'm currently in the process of upgrading my stock RCD220 to RCD320 which was given by one my friend. Once I jumped into DIY, I came to know that it is not something plug and play since RCD320 requires can bus connection. Can anyone here guide me to find the right solution for this? While researching, I came to know that there is something called as can bus simulator(adapter) which is the solution for this. Where can I buy it in India and what would be the cost? Also, is it the only method available for this upgrade?