hey guys wuts up....WEll i'll tell u wut i've got on my 5.0 to help diagnose problem... I've got a UPR CAI, Mac pro chamber o/r H-pipe with no o2 sensors on,(i'm buying sum next week on my check), flowmaster american thunder catback, and new plugs.....I have about 130,000 on the engine and itz runnin pretty good, except every time i wake up in the morning theres oil spots on my drive way,now i just switched to synthetic mobil 1 and my question is whaT could be causing the leak(Could a bad gasket on the oil plug cause it) Also do u lose alot of power with no O2's.... thanx