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. Glad to know you own India's best selling hatchback!
Alto has Electronic power steering (EPS), to install this a few parts needs to be changed and some wiring work is required. Our member Varun has it in his M800,
Click here to know more My Modified Maruti 800.
New setup costs approx. 30K (total set up)
Used one from Scrapyard/garage will cost you: about 15 - 17K (total set up)
Steering column, power steering motor, ECM for this motor, - these are the parts you need to procure.
Unless you plan to retain the car for the next 5+years, do not invest money in this upgrade. Other option:
Getting Matiz power steering installed in your car, it is a lengthy process, some claim to have done it, I am yet to see a functioning one though. Advantages of Electronic Power Steering vs Hydraulic Power Steering