DOHC or Double OverHead Cam engine used in many cars now a dayz. With this engine it is possible to install multiple valves per cylinder and place intake valves on the opposite side of exhaust vales, DOHC engine can "breath" better meaning that it can produce more power with smaller engine volume. Cars like Hyundai i10 and Hyundai i20 are fitted with DOHC engine.
Well, all you need to do is to coordinate with the dealership and the RTO to the get the registration process done. Moreover, it will be dependent upon where you will be driving the car, Delhi or Allahbad.
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The rear suspension of a car like your i10 comprises of a dead axle, springs and dampers. There could be a number of problems that could result in the replacement of any one these or even each and every one of these parts. The axle costs around 9,800 rupees, could be more or less depending upon your area. The springs cost around 980 rupees each and the dampers that cost around 1400 rupees each. Apart from these there would be labour charges that you could confirm at your nearest Hyundai dealer. The price of these part may vary according to the area you live in, kindly confirm it at your nearest dealership.