[rfuerst911sc]

What is the diameter of the pipe you are trying to remove ? Is your angle grinder a 4 1/2 " ? I find it hard to believe that you can't cut the pipe out with it . You may have to do several long cuts then multiple cross cuts . I agree the pipe is probably spot welded to the bumper . I think the best you can hope for is to cut out about 75 percent of it the balance you will have to grind out .

The multi tool that others have suggested is a great tool , however in this application I think it would be painfully slow. The blades are generally only one inch wide so they take a very small bite .