Depending on how you set your twins up, you may not want to t your oil drains. You need your primary to set up higher if you want to drain them this way. I ran #12 parker pushlok hose for drains. I got flanges from http://www.turbodaves.com and all my hose and fittings from a local hydraulic shop. Secondary to stock location with a JIC fitting welded on the stock drain nipple, and primary to a bung I welded in the oil pan. I teed them when I first put them together and they didn't drain well enough because of the primary being low and its brace being in the way of easily routing the drain to the stock location. Some people use a flexible drain for the secondary and make a drain/brace combo for the primary. http://sourceautomotive.biz/flexibleturbooildrain.aspx Check out Source Automotive for parts and ideas.