The new 372XP X-Torq is definately stratofied. However, they built the saw off the same crankcase as the 372 we have always had. It does use a single venturi to feed both the clean air and the fuel charged air. The carb has a divider in it so that only one half of it takes on fuel. This divider continues through the intake duct and into the cylinder. I have not modified a 575, so can't really tell you how it compares. Hope that helps a little.