@ Rafay:
Bro, just a suggestion if u own a prosmatec, then it's better not to opt for a Cng as after a couple of years probably after 3-4 years you will probably feel jerk in shifting.
For Cng, just visit CNG kit zone located @ Main Jamshed Rd, they are really professional, awesome services & reasonably priced..... They will give you all the options.....