yes, EPS can be fitted in your mehran easily .
it will cost you 11k and will not effect your engine power at all.
it is very effective and very reliable also.
had installed it in my car 2 years ago, still working like a charm. basically they will install Japanese alto eps power steering assambly in your car with little modification.
go to sultan-ka -khu in rwp ask for "shaa baba autos" or call this number "03009854624"