Even I have a sonata gold and I tried putting a cng kit because of the obvious high running cost . I got a sequential kit installed because the dealer said that since sonata is a big car , the normal kit will not be very succesful plus the sequential kit will give the car a good acceleration and the difference wont be much between driving on cng and driving on petrol . But it didnt work out and the performance of the car became really bad... On petrol , it used to go to 170 km/hr with amazing acceleration but on cng , it wasnt crossing 80 km/hr ... i thought the engine might get damaged so I got it removed... hows your experience and where did you get it fitted from ??
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