Sali and F1, yarr I live in Karachi. I want to install the dual spark plugs and Spark wires as ya ppl told tht its the most cheapest item. Temme how much it cost and where in Karachi they are aavailable and wats the particular name for these plugs and wires which local ppl in our markets can understand. And is muffler and the exhaust system are the same thing or they are different. How much a good exhaust system cost. Finally I m planning to install CNG from Friends CNG near City PAF Chapter, Many ppl told me tht its quite a good place. I gotta Daihatsu Charmant 84 model in mint condition, no engine work so all these things do effect the engine in tht case.