PG - thanks. Actually I always wondered what that big U-shaped plastic tube was for. Makes sense that it leads to the turbo. So I assume I can go out and remove it, start the engine with it gone, then test with a piece of plywood over the inlet to see if it stops the engine. Should not hurt to run the engine for a few minutes with that tube removed I guess? Apply plywood to the inlet on the top which, I think, goes to the turbo as opposed to the other end of the tube?