I actually found that my car ran worse with it reversed. It was more hesitant and boost felt less severe...something to think about. I personally think having it reversed is illogical in terms of it's function. The piston in the DV should be pushing the presurrised boost air downwards into the TIP, in standard fitment this is exactly what it does when the vacuum drops the piston. In reverse, the vacuum is pulling the piston open at a sideways angle, allowing the presurrised air to escape through a smaller outlet into the TIP and then when the vacuum drops the piston, it's shoving it back through into the charge pipe.