there ia FAMOUS CNG kit installations in walten Near Khabiyan-e-iqbal near defence
its name is "CNG WORKSHOP"
this shop install CNG in land crusers and prodeos..like any other car .thay are like totally professols in CNG installations i have a accord 88 and ..main na bi in saa dalwahi hai
thay also have some other branches in lahore but i dont know !
check it