"1. yes i mean normal kits are ok 2. If he is authorized maruti service center then go ahead with any kits they install, just check if they are authorized by RTO in Delhi 3. lets assume even if it reduces the price by 50k. you will still save much more than that if you intend to use the car for couple of years. 4. I feel the value will increase with the rising fuel costs people would want to buy a second hand car which already comes with CNG" - Amit Desai