Don’t do it… you’ll end up spending over $5000 easily and still be a 17 second car. Ask Carbonfiberhooded. He turbo’d his automatic esi and has said time and time again, that he shouldn’t have done it. Plus you can only run about 8lbs of boost safely on the stock 420A, unless you build the motor. Safe bet is to stay away and look for a GST or GSX.