With the VSI system Prins strives for optimal emission and cost reduction. With the VSI system there is no difference with driving on petrol. The VSI system is available in an LPG as well as a CNG version and is also suitable for the latest generation Direct Injection engines (). This alternative fuel system is the most advanced vapour injection system available on the market. VSI system VSI is an abbreviation for 'Vapour Sequential Injection'.
