Hello, well, now I’m a little irritated. what I’ve taken from the contributions so far is that the Vortecs are gas-resistant up to year 99-98 and they don’t have any more. So since I don’t have a Tahoe yet, this makes it difficult for me to make the purchase decision. Actually I wanted to get a model from year 2000 on. But since these don’t have gas-resistant valves, the conversion to gas seems to be a little more complex, doesn’t it? U.K.