They are externally wastegated with Tial flanges, which measure 64mm in diameter. These make your turbos mount behind your headlights. I paid $1200 for them a year ago and never mounted them. They have been sitting in my closet the entire time. Make offer or trade for guitar/amp. [ http://img.photobucket.com/albums/v654/YoshisakaN/IMG00101- ] 20100302-1132.jpg