after the car runs from a while, a greyish white smoke comes out the exhaust. a noticable amount. after boosting the car hard tonight, it starting coming out a lot. The car is having trouble boosting, and makes a terrible "moo" sound when letting off the gas.. It has a removed air pump, so its a different moo sound, and its non sequential, so i dont think its a vaccume problem. any suggestions, or ways to further act on this problem. any help would be great

~andrew