When I put in my TSP 1-7/8 LT headers I was able to get them in by removing the oil filter and getting the car high enough in the air so that the headers were 90 degrees to the orientation that they would be installed. A little bit of a muscle push and they went up and into place. I did this on jack stands in my garage. It varies from car to car though. There have been some that needed to unhook the steering knuckle but never have I heard about a motor mount needing to come out.