We connected the sandwich adapter and screwed on the OE filter. We used 2,000-degreee thermal wrap on the first few inches of our hose due to extreme heat from the catalytic converter. While one large hose is included, it's easiest to cut the hose directly in half. Using the included hose clamps, connect both ends of the hose, one end to the cooler and the other to the sandwich. There is no in, out, top or bottom, so whichever way routes the best is the one to use.