Correct me if I am wrong. Don't all R134a systems have a multi flow (aka parallel flow) condenser?
@chsamad2607 Have you compared the ac performance of your car with a similar Alto 1000 of the same type? reason for asking is that perhaps the ac performance is like this in all cars like yours. If you still feel that the performance of your car is less than other similar cars then you should look at why it is so before you go about "upgrading" original hardware.
Looking at the gas charge would be the first place to start. Are there any contaminants in the gas like moisture? Is the gas of good quality? Is the amount of gas in the system correct? Once these have been ruled out, the next area could be the recirculation door. Does it fully close when it is set to close position? Next could be to look at the evaporator. Is it clear and not partially clogged up with dirt. Has the compressor gone weak? Is the expansion valve clear? is the filter in the gas circuit not clogged. Is the receiver drier doing its job. Was it replaced at the last time you did a gas recharge?
All these things and more needs to be checked before you take the decision to do alterations.