I'm having a friend weld me a stainless intake rock grate for my American Turbine SD-309. I have broken mine a few times, some without hitting anything, just harmonics I think. We are planning on heating it after it is made in a furnace to relieve stress that may be in the stock ones. Also sharpening the leading edges. Would putting in a sideways bar in the middle reduce flow too much? It is hooked to a GM 350, 4400 RPM's @ 53 MPH. Any advice about making a new / better one?