i can guide you to the place where i get the work done in my car and i am more than satisfied,
i dont trust anybody in pindi, but this guy is in Islamabad G-10, I just got lambda installed in my car from here last week.
contact Aamir: 0333-5584987 : G-10 Behind Mari Gas
Cng can be installed better in an Exi, rather than a VTI with ABS, so u r lucky to have an EXI,