I think I know the anwer already. I looked at a used 56 inch Lazer Z HP today with the ultravac 2 bagger and the 23 Kawi engine on it and the Triton Deck. Not sure of the year but it only has 383 hours on it. I currently run a 52 inch HP with the same engine, the Trivantage deck and the Ultravac and at times I wish I had some more horse power. The ultravac really saps a good bit of power. My question is how much more of a draw is that extra 4 inches of deck? And is the Triton the same deck as the Trivantage? It looks like it to me. Would I regret getting this machine?