If you use the Search function on the board and search for Micro-Dynamics or vortex, I think you will find several threads on this subject. But I don't think VGs will allow you to increase gross weight. I hear that the Flint tip tank mod has a gross weight increase, and I think Owen Bell (see Web Pages section of this site) also has a gross weight mod, but I have no personal experience with either mod.
I think a gross weight increase would seriously compromise single engine performance. There is only so much you can do with a certain amount of horsepower...
Kevin
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