Having dynoed many 16v and 20v's over the years, 16v with cams etc. You have to go fairly hot cams to get near stock 20v BT power, your 16v would be down on torque, with a BT you can have your cake and eat it too. The 16v would really need ITB's to make BT power so there's another expense, by the time you add up the initial cost of a 16v, a rebuild, some cams, ITB's, you may as well just put a BT in.