An engine designed for a particular fuel , but being forced to run on another will definitely face problems later on. This is not said from a fanboy perspective but applies to all cars. Here's a little tidbit. The exhaust gas temperatures generated of LPG/CNG are always higher than those of petrol. Sooner or later you are gonna fry your turbo/ your valvetrain and the whole engine in general. Slowly but surely. All this talk of sequential kits being superior and safe is what i find nonsense. Unless your engine is capable of using alternate fuels straight from the factory, any kit , howsoever clever is worthless. Thats my opinion and i stick to it. Do not go for aftermarket kits just because XYZ car is running on them or not. Gurjinder.