I purchased an old Asplundh 4 cylinder chipper (the guy I bought it from told me it was a 1974). Anyway I need to get an exhaust manifold for this thing. Can anyone help me with where to get one or even what type engine (if something special) is in this thing. I am mechanical but I don't really know the first thing about types of engines, etc.. Also what is that big oil type filter outside on the body? and can it be replaced with something else? Also if anyone has a manual could they please send it to [email protected]. I do have one but it is missing some things. Thanks.