So there is a ~3/4" pipe that comes off the exhaust manifold, it goes towards the front, has a coil for cooling, goes through what looks like an air conditioning dryer, then a hose that goes to the air cleaner. I assume this is some kind of emission devise. What does it do and do I need it? I would like to use a smaller air cleaner (Weber) and need to know if I need to keep this thing.