Bhai I dont know anybody in khi may be khi members could help u out.
From any good shop and u can buy it from pakwheels also alot people are selling irridium plugs here go for ngk plugs.
Bhai go for caltex fully synthetic and change it at every 5k interval
If u dont know the history than I think u should change all fluids including coolant
Sure will pm u my number its not a big deal to service catalyic converter just one screw u need to open waisay plugs keh samnay aik bari si covered dholki nazar arahi hu gi us mein say aik white wire nikal rahi hu gi aur baray screw hu ga us wire keh sath u need to that screw and than u need to scratch inside with screw driver after that u start the car and rev it hard orange cloud will come out from catalyic converter hole and back silencer
Plus I will send u my number and will have a discussion over phone
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