Factory fitted vs aftermarket CNG kit: Which one to get when buying a car?

If you want a CNG car, there are two options out there; you can either get a factory-fitted CNG kit or an aftermarket CNG kit, but which of the two is better?

Related Keywords

Maruti Suzuki Wagon , Maruti Suzuki , Tata Altroz , Maruti Suzuki Celerio , , New Maruti Suzuki Wagonr , Auto , Png Car , Cng Kit , Ng Conversion , Etrofitting Cng ,