[CNGBiFuel]

Well there's a thing. I've just done the very opposite.

I found a factory Volvo BiFuel car with what might be 'the best solution' - it's factory system removed and a Zavoli LPG kit installed. It was pretty poor job that didn't work. I was going to put a 5th gen. system sourced from our very own 'classicswede', thus - if you like - its third system install.

I'm sure it would have been very good. Only, it came easier to put everything back to ex-factory standard.

That's not to say any other way is wrong, if it works that's the right way for you. In my case I could find no logical reason to stray from the factory fit Necam system, it works.