I need to convert my Toyota Vitz 2006 Model F1.0 to RS 1.5. Kindly anyone can help with with sourcing parts or by giving good ideas?
Nobody will tell you that is a good idea, unless you want to spend lots of money and get a wreck of a car in return.
Sell it and find an original 1.5 vitz RS. Other option will consume 5 lakh plus and in the end you will sell your car in 2 million. Or find a swapped car with 1 NZ you can find it in a budget of 2 2.4 million
Buy a RS instead. If you still want to get your hands dirty then source a half cut and transfer.