I'm in the process of figuring out when I want to go with twins. Cost of the turbos is pretty simple. How much should I expect to spend on getting the headwork done and any other incidentals to make this a proper and (relatively) reliable install. I say relatively b/c with any mods there is always the chance of creating unforseen problems. Thanks. Also any reccomendations on turbos or who sells a system? I've looked at Piers since that was the name I see the most of on this board with reguard to turbos.